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Series Resistive Circuits Electronics Lesson Plan Performance Objective At the end of the lesson, students will demonstrate the ability to apply problem solving and analytical techniques to calculate series circuit electrical values by completing the handouts and passing the Series Resistive Circuits Quiz. Specific Objectives Identify a series resistive circuit Use current loops to determine electrical polarity Use Kirchhoff’s Law to derive circuit analysis tools Analyze circuits and calculate a variety of electrical values using the information given for a series circuit Terms Battery- a chemical device used to create DC voltage Fuse- a circuit protection device that opens when excessive current flows through it Switch- a control device used to turn a circuit on or off Load- the device a circuit is designed to deliver power to, represented by a resistor symbol Ohm’s Law- a formula that shows the mathematical relationship between current, voltage, and resistance Kirchhoff’s Voltage Law- the sum of all voltages in a closed loop equals zero Kirchhoff’s Current Law- the sum of the currents into a node is equal to the sum of the currents leaving the node Node- an electrical junction point Series Circuit- a circuit with only one path for current flow Voltage Drop- a voltage difference measured across a device Time practice, and one 50-minute period for a It should take approximately three 50-minute periods to teach the lesson, three 50-minute periods to work problems and analyze circuits through guided lab session. Preparation TEKS Correlations This lesson, as published, correlates to the following TEKS. Any changes/alterations to the activities may result in the elimination of any or all of the TEKS listed. 1 Copyright © Texas Education Agency, 2014. All rights reserved. Electronics 130.368 (c) o (5) The student implements the concepts and skills that form the technical knowledge of electronics using project-based assessments. The student is expected to: (C) demonstrate knowledge of the fundamentals of electronics theory; (D) perform electrical-electronic troubleshooting assignments; and (E) develop knowledge of voltage regulation devices. 130.368 (c) o (6) The student applies the concepts and skills to simulated and actual work situations. The student is expected to: (A) measure and calculate resistance, current, voltage, and power in series, parallel, and complex circuits; and (D) demonstrate knowledge of common devices in optoelectronics. 130.368 (c) o (8) The student learns the function and application of the tools, equipment, and materials used in electronics through project-based assignments. The student is expected to: (A) safely use tools and laboratory equipment to construct and repair circuits; and (B) use precision measuring instruments to analyze circuits and prototypes. 130.368 (c) o (9) The student designs products using appropriate design processes and techniques. The student is expected to: (A) interpret industry standard circuit schematics; and (D) produce schematics to industry standards. Interdisciplinary Correlations Geometry 111.41 (c) o (1) Mathematical process standards. The student uses mathematical processes to acquire and demonstrate mathematical understanding. The student is expected to: (A) apply mathematics to problems arising in everyday life, society, and the workplace; and (B) use a problem-solving model that incorporates analyzing given information, formulating a plan or strategy, determining a solution, justifying the solution, and evaluating the problem-solving process and the reasonableness of the solution. Occupational Correlation (O*Net – www.onetonline.org/) Job Title: Electronics Engineering Technicians O*Net Number: 17-3023.01 2 Copyright © Texas Education Agency, 2014. All rights reserved. Reported Job Titles: Digital Tech (Digital Technician), Electrical Technician, Electronics Engineering Technician, Electronics Technician, Engineering Technician (Engineering Tech), Failure Analysis Technician (FA Technician), Refurbish Technician (Refurb Tech), Senior Electronics Technician, Technician, Test Technician Tasks Read blueprints, wiring diagrams, schematic drawings, or engineering instructions for assembling electronics units, applying knowledge of electronic theory and components. Identify and resolve equipment malfunctions, working with manufacturers or field representatives as necessary to procure replacement parts. Test electronics units, using standard test equipment, and analyze results to evaluate performance and determine need for adjustment. Adjust or replace defective or improperly functioning circuitry or electronics components, using hand tools or soldering iron. Assemble, test, or maintain circuitry or electronic components, according to engineering instructions, technical manuals, or knowledge of electronics, using hand or power tools. Perform preventative maintenance or calibration of equipment or systems. Maintain system logs or manuals to document testing or operation of equipment. Provide customer support and education, working with users to identify needs, determine sources of problems, or to provide information on product use. Write reports or record data on testing techniques, laboratory equipment, or specifications to assist engineers. Soft Skills Dependability Cooperation Attention to Detail Initiative Integrity Adaptability/Flexibility Accommodations for Learning Differences It is important that lessons accommodate the needs of every learner. These lessons may be modified to accommodate your students with learning differences by referring to the files found on the Special Populations page of this website. Preparation Review the Series Resistive Circuits slide presentation and lesson plan prior to each class. Review and become familiar with the terminology and the example problems used. Have materials and handouts ready prior to the start of the lesson. Have parts and equipment ready before lab. Have an example circuit to show the class. Cover the following lessons as prerequisites (in order): 1. The Nature of Matter 2. The Nature of Electricity 3. Conductors and Insulators 3 Copyright © Texas Education Agency, 2014. All rights reserved. 4. 5. 6. 7. Sources of Electrical Energy Voltage and its Measurement Resistance Ohm’s Law References Roberts, Gerrish, and Dugger. (1999). Electricity & electronics. Tinley Park, Illinois: Goodheart-Willcox Company. Mitchel E. Schultz. (2007). Grob’s basic electronics fundamentals of DC and AC circuits. Columbus, Ohio: McGraw Hill. Instructional Aids Handout One, summary of the “tool kit” and the troubleshooting method Handout Two, step-by-step troubleshooting guide for example two Handout Three, two resistor sample problems for practice (with key) Handout Four, three resistor sample problems for practice (with key) Series Resistive Circuits: Lab (with key) Series Resistive Circuits: Worksheet (with key) Series Resistive Circuits Quiz (with key) Introduction The purpose of this lesson is to help students develop a systematic, step-by-step method to analyze circuits and solve problems. Ask o How many of you have ever had a problem in your life? o Have you ever wanted a really good technique to solve that problem? Show o An example circuit Say o A lot of you think that electronics is about learning how an electrical circuit or electronic device works. o But what electronics is really about is how to logically and systematically solve a problem. o Electronics will teach you how to think in a logical and step-by-step way, which is going to help you throughout your life. Ask o Who wouldn’t want to learn something that will help them for the rest of their life? 4 Copyright © Texas Education Agency, 2014. All rights reserved. Outline MI OUTLINE I. II. Introduction to Series Resistive Circuits (slides 112) A. Series circuits are used as an introduction to problem solving. B. Review the basics if necessary. C. Go over the terms and devices used in the example circuit and circuit operation. Introduction to Circuit Analysis (slides 13-17) A. Ohm’s Law B. Kirchhoff’s Voltage Law C. Kirchhoff’s Current Law D. Definition of a series circuit III. Using Kirchhoff’s Voltage Law (slides 18-22) A. Polarities are key. B. Draw a current loop around the circuit from the negative side of the battery to the positive side. C. Place arrows showing the direction of current flow from negative to positive in the circuit. D. The arrows indicate the polarity of voltage across a device from negative to positive. E. The key take away is to show that the voltage drops in a circuit equal the source voltage. F. Use the voltage drop to calculate current. IV. Using Kirchhoff’s Voltage Law with multiple components (slides 23-27) A. In this segment, begin to emphasize the stepby-step process to determine the polarity of the voltage drops. B. Again, the process involves drawing the loop, showing the arrows, and assigning polarities for the voltage drops. C. The sum of the voltage drops equals the supply voltage. NOTES TO TEACHER Show Series Resistive Circuits slide presentation. After presentation, have students work practice problems using both guided and independent practice. Students start with simple problems to learn the formulas and the step-by-step process, then work their way to more difficult problems designed to teach problem-solving skills. 5 Copyright © Texas Education Agency, 2014. All rights reserved. MI OUTLINE V. Introduce the third circuit analysis formula (slides 28-30) A. Review the summary and the two formulas developed so far. B. Use Ohm’s Law to substitute IR for V in the voltage drop formula. C. Solve this formula for resistance to get the third formula used to analyze series circuits. VI. Example Problem One (slides 31-41) A. Go over this section slowly emphasizing that you are developing the steps in a problemsolving process. B. Note the use of symbols for voltage, current, and resistance. C. Emphasize the use of subscripts to identify quantities that go together for a component. D. Note the relationship of the voltage drops to the component resistance value. VII. Example Problem Two (slides 42-46) A. This section develops a formal step-by-step process. B. Practice is necessary to ingrain and hone the process of problem solving; it must become natural and intuitive. C. This is a summary and formal development of the steps needed to solve a problem. D. Always start by writing down what the problem is asking for and the equations needed to solve for that value. E. Work through the process of finding the values needed to solve the problem; sometimes all the needed values are given—most of the time they are not. Intelligences Guide F. Note Multiple the relationship between voltage drop and resistance value; when students understand this relationship, solving electrical problems becomes much easier. NOTES TO TEACHER Emphasize that problem solving is a skill developed by practice. Give students Handout One and Handout Two after going over Example Problem Two in the presentation. Handout One and Handout Two are summaries of material covered in the presentation and can be used during guided and independent practice as problem solving aids. It is at the teacher’s discretion whether the handouts can be used during assessment. The problems in Handout Three and Handout Four can be used for both guided practice and independent practice. 6 Copyright © Texas Education Agency, 2014. All rights reserved. MI OUTLINE G. The voltage divider rule can be expressed in many different ways as long as the relationships are mathematically consistent. VIII. Example Problem Three (slides 47-52) A. Similar to example two but with more variables to solve for. B. Basically just more practice using the developed step-by-step method with a slightly more complex circuit as an example. C. Students should practice several more problems like this—first using guided practice, and then moving to independent practice. IX. Example Problem Four and Example Problem Five (slides 53-60) A. These examples show problems that are not as straightforward. B. These examples show that sometimes the information needed to solve a problem is not obvious. C. These problems require a few more steps to solve and they are used to emphasize the fact that sometimes there are several steps to find a value needed to solve the original problem. D. There are a number of problems in Handout Three and Handout Four that are similar to these problems. X. Series Resistive Circuits Quiz Copyright © Texas Education Agency, 2014. All rights reserved. NOTES TO TEACHER Emphasize that problem solving is a skill developed by practice. Give students Handout Three and Handout Four to practice working problems after going over Example Problem Three in the presentation, but they will not be able to work all the problems until after Example Problem Four and Example Problem Five have been covered. You can break the presentation after going over Example Problem Three. Work problems 1-4 on Handout Three and Handout Four, then go back to the presentation the next day to cover Example Problem Four and Example Problem Five. Then have students work problems 5-8 on each handout as guided practice. The next day, have students work problems 9-12 on each handout as independent practice. The next day of the presentation, do the lab. Have the students take the quiz 7 on the last day. Multiple Intelligences Guide Existentialist Interpersonal Intrapersonal Kinesthetic/ Bodily Logical/ Mathematical Musical/Rhythmic Naturalist Verbal/Linguistic Visual/Spatial Application Guided Practice Problems 1-8 of Handout Three and Handout Four. Independent Practice Problems 9-12 of Handout Three and Handout Four. Summary Review The students will be able to give the four formulas in the series circuit tool kit from memory. The students will be able to describe a step-by-step, problem-solving process. Evaluation Informal Assessment The teacher will observe students during independent practice and during lab. Formal Assessment Students will take the quiz located at the end of this document. The teacher can add additional questions based on Handout Three and Handout Four. Enrichment Extension The students will be able to create their own problems for both two and three resistor series circuits. 8 Copyright © Texas Education Agency, 2014. All rights reserved. Handout One The “Tool Kit” for solving series circuit problems is located below: Summary of the step-by-step method of problem solving is listed in the following steps: 1. 2. 3. 4. 5. 6. 7. Write down what the problem is asking for. Write the formula(s) needed to solve for the value(s) that will solve the problem from step one. If the values needed for the formula are given, plug them into the equation and solve. If the values needed are not given, use one of the above “tools” to find a formula to give what is needed. Repeat step three as necessary until you are finally able to calculate a value that leads to a solution. This process results in a sequence of problems that need to be solved in order. Once you are able to solve for a value, plug that value into the previously developed formula. Work your way back through the steps of the process developed in steps three and four, writing down each formula and solution. Highlight or circle the answer to the problem from step one. 9 Copyright © Texas Education Agency, 2014. All rights reserved. Handout Two – Circuit Example Two Solve for the voltage drops across R1 and R2 1. Write the equations for VR1 and VR2 VR1 = I1 • R1 VR2 = I2 • R2 2. To use these equations to solve for voltage, we need current. Write the equation for current I= 3. Looking for known values in this equation, we have VT, we need RT RT = R1 + R2 = 200 Ω + 600 Ω = 800 Ω 4. Substitute this into the formula from step two IT = I1 = I2 = 15 mA 5. Now solve for voltage drops from step one VR1 = I1 • R1 = 15 mA • 200 Ω = 3 V VR2 = I2 • R2 = 15 mA • 600 Ω = 9 V 10 Copyright © Texas Education Agency, 2014. All rights reserved. Name______________________________________Date________________________Class_____________ Handout Three – Sample problems with two resistors R1 R2 VS 1. VS = 16 V, R1 = 330 Ω, R2 = 470 Ω, Solve for V1 and V2 2. VS = 15 V, R1 = 2.7 kΩ, R2 = 6 kΩ, Solve for V1 and V2 3. VS = 9 V, R1 = 15 kΩ, R2 = 8.6 kΩ, Solve for V1 and V2 4. IT = 25 mA, R1 = 2 kΩ, R2 = 3 kΩ, Solve for Vs 5. IT = 3.33 mA, R1 = 2.7 kΩ, R2 = 1.5 kΩ, Solve for Vs 6. VS = 20 V, R1 = 15 kΩ, V2 = 7.2 V, Solve for R2 7. VS = 12 V, R1 = 6.8 kΩ, V1 = 8 V, Solve for R2 8. V1 = 9 V, R1 = 3.3 kΩ, V2 = 7.2 V, Solve for R2 and Vs 9. IT = 5.2 mA, R1 = 1.2 kΩ, R2 = 3.5 kΩ, Solve for Vs 10. VS = 22 V, R1 = 5.6 kΩ, V2 = 7.2 V, Solve for R2 11. VS = 5 V, R1 = 2.8 kΩ, V1 =1.8 V, Solve for R2 12. V1 = 16.2 V, R1 = 4.7 kΩ, V2 = 7.2 V, Solve for R2 and VS 11 Copyright © Texas Education Agency, 2014. All rights reserved. Name______________________________________Date________________________Class_____________ Handout Four – Sample problems with two resistors R1 VS R2 R3 1. VS = 15 V, R1 = 330 Ω, R2 = 470 Ω, R3 = 250 Ω, Solve for V1, V2, and V3 2. VS = 15 V, R1 = 2.7 kΩ, R2 = 4.5 kΩ, R3 = 6.2 kΩ, Solve for V1, V2, and V3 3. VS = 9 V, R1 = 15 kΩ, R2 = 8.6 kΩ, R3 = 6 kΩ, Solve for V1, V2, and V3 4. IT = 8 mA, R1 = 1.2 kΩ, R2 = 3.3 kΩ, R3 = 2 kΩ, Solve for Vs 5. IT = 3.16 mA, R1 = 2.7 kΩ, R2 = 1.5 kΩ, R3 = 860 Ω, Solve for Vs 6. VS = 20 V, R1 = 15 kΩ, V2 = 6.85 V, R3 = 9 kΩ, Solve for R2 7. VS = 12 V, R1 = 6.8 kΩ, V1 = 4 V, R3 = 5.4 kΩ, Solve for R2 8. V1 = 9 V, R1 = 3 kΩ, V2 = 7.2 V, V3 = 5.8 V, Solve for R2 and R3 9. IT = 3.2 mA, R1 = 1.2 kΩ, R2 = 3.5 kΩ, R3 = 2.3 kΩ, Solve for Vs 10. VS = 22 V, R1 = 5.6 kΩ, V2 = 7.2 V, R3 = 8.4 kΩ, Solve for R2 11. VS = 5 V, R1 = 4.8 kΩ, V1 =1.6 V, R3 = 6.4 kΩ, Solve for R2 12. V1 = 7.2 V, R1 = 4.6 kΩ, V2 = 2.8 V, V3 = 1.2 V, Solve for R2 and R3 12 Copyright © Texas Education Agency, 2014. All rights reserved. Handout Three – Sample problems with two resistors (KEY) R1 R2 VS 1. VS = 16 V, R1 = 330 Ω, R2 = 470 Ω, Solve for V1 and V2 (6.6 V, 9.4 V) 2. VS = 15 V, R1 = 2.7 kΩ, R2 = 6 kΩ, Solve for V1 and V2 (4.66 V, 10.34 V) 3. VS = 9 V, R1 = 15 kΩ, R2 = 8.6 kΩ, Solve for V1 and V2 4. IT = 25 mA, R1 = 2 kΩ, R2 = 3 kΩ, Solve for Vs (125 V) 5. IT = 3.33 mA, R1 = 2.7 kΩ, R2 = 1.5 kΩ, Solve for Vs 6. VS = 20 V, R1 = 15 kΩ, V2 = 7.2 V, Solve for R2 7. VS = 12 V, R1 = 6.8 kΩ, V1 = 8 V, Solve for R2 (3.4 kΩ) 8. V1 = 9 V, R1 = 3.3 kΩ, V2 = 7.2 V, Solve for R2 and Vs 9. IT = 5.1 mA, R1 = 1.2 kΩ, R2 = 3.5 kΩ, Solve for Vs 10. VS = 22 V, R1 = 5.6 kΩ, V2 = 7.2 V, Solve for R2 11. VS = 5 V, R1 = 2.8 kΩ, V1 =1.8 V, Solve for R2 12. V1 = 16.2 V, R1 = 4.7 kΩ, V2 = 7.2 V, Solve for R2 and Vs (5.72 V, 3.28 V) (14 V) (8.4 kΩ) (2.64 kΩ, 16.2 V) (24 V) (2.7 kΩ) (5 kΩ) (2.1 kΩ, 23.4 V) 13 Copyright © Texas Education Agency, 2014. All rights reserved. Handout Four – Sample problems with two resistors (KEY) R1 VS R2 R3 1. VS = 15 V, R1 = 330 Ω, R2 = 470 Ω, R3 = 250 Ω, Solve for V1, V2, and V3 (4.71 V, 6.71 V, 3.57 V) 2. VS = 15 V, R1 = 2.7 kΩ, R2 = 4.5 kΩ, R3 = 6.2 kΩ, Solve for V1, V2, and V3 (3.02 V, 5.04 V, 6.94 V) 3. VS = 9 V, R1 = 15 kΩ, R2 = 8.6 kΩ, R3 = 6 kΩ, Solve for V1, V2, and V3 (4.56 V, 2.61 V, 1.82 V) 4. IT = 8 mA, R1 = 1.2 kΩ, R2 = 3.3 kΩ, R3 = 2 kΩ, Solve for Vs (52 V) 5. IT = 3.16 mA, R1 = 2.7 kΩ, R2 = 1.5 kΩ, R3 = 860 Ω, Solve for Vs (16 V) 6. VS = 20 V, R1 = 15 kΩ, V2 = 6.85 V, R3 = 9 kΩ, Solve for R2 7. VS = 12 V, R1 = 6.8 kΩ, V1 = 4 V, R3 = 5.4 kΩ, Solve for R2 (8200 Ω) 8. V1 = 9 V, R1 = 3 kΩ, V2 = 7.2 V, V3 = 5.8 V, Solve for R2 and R3 (R2 =2.4 kΩ and R3=1.8 kΩ) 9. IT = 3.2 mA, R1 = 1.2 kΩ, R2 = 3.5 kΩ, R3 = 2.3 kΩ, Solve for Vs (22.4 V) 10. VS = 22 V, R1 = 5.6 kΩ, V2 = 7.2 V, R3 = 8.4 kΩ, Solve for R2 11. VS = 5 V, R1 = 4.8 kΩ, V1 =1.6 V, R3 = 6.4 kΩ, Solve for R2 (3.8 kΩ) 12. V1 = 7.2 V, R1 = 4.6 kΩ, V2 = 2.8 V, V3 = 1.2 V, Solve for R2 and R3 (R2=1.8 kΩ, R3=780 Ω) (12.5 kΩ) (6.8 kΩ) 14 Copyright © Texas Education Agency, 2014. All rights reserved. Name______________________________________Date________________________Class_____________ Series Resistive Circuits Lab Build the circuit shown below. If you do not know how to use the breadboard system, ask your teacher. After you have built the circuit, complete the procedures listed below. Record the measurement results in the blanks provided. Caution: While changing positions of the meters, turn off the power supply. Caution: Be sure to remove power from the circuit before measuring resistance. Caution: Do not measure volts with the multimeter set to amps or milliamps. Procedures Results 1. Remove power from circuit. 2. Measure resistance R . Measure from point A to point D. T 3. Reconnect power to the circuit. 15 Copyright © Texas Education Agency, 2014. All rights reserved. 4. Measure voltage E across R . Measure from A to B. 1 1 5. Measure voltage E across R . Measure from B to C. 2 2 6. Measure voltage E across R . Measure from C to D. 3 3 7. Disconnect circuit at point A. Place multimeter in series with point A and measure the total current I of the circuit. T 8. Reconnect point A. 9. Disconnect resistor R at point B. Place multimeter in series with 1 point B and measure current I . 1 10. Reconnect R . 1 11. Disconnect resistor R at point C. Place multimeter in series with 2 point C and measure current I . 2 12. Reconnect R . 2 13. Disconnect resistor R at point D. Place multimeter in series with 3 point D and measure current I . 3 14. Check that you recorded all of the results requested for this lab. 16 Copyright © Texas Education Agency, 2014. All rights reserved. Series Resistive Circuits Lab (Key) Build the circuit shown below. If you do not know how to use the breadboard system, ask your teacher. After you have built the circuit, complete the procedures listed below. Record the measurement results in the blanks provided. Caution: While changing positions of the meters, turn off the power supply. Caution: Be sure to remove power from the circuit before measuring resistance. Caution: Do not measure volts with the multimeter set to amps or milliamps. Procedures Results 1. Remove power from circuit. 2. Measure resistance R . Measure from point A to point D. T ≈ 100 Ω 3. Reconnect power to the circuit. 17 Copyright © Texas Education Agency, 2014. All rights reserved. 4. Measure voltage E across R . Measure from A to B. 1 1 ≈ 56 volts 5. Measure voltage E across R . Measure from B to C. 2 2 ≈ 33 volts 6. Measure voltage E across R . Measure from C to D. 3 3 ≈ 11 volts 7. Disconnect circuit at point A. Place multimeter in series with point A and measure the total current I of the circuit. T ≈ 1 amp 8. Reconnect point A. 9. Disconnect resistor R at point B. Place multimeter in series with 1 point B and measure current I . 1 ≈ 1 amp 10. Reconnect R . 1 11. Disconnect resistor R at point C. Place multimeter in series with 2 point C and measure current I . 2 ≈ 1 amp 12. Reconnect R . 2 13. Disconnect resistor R at point D. Place multimeter in series with 3 point D and measure current I . 3 ≈ 1 amp 14. Check that you recorded all of the results requested for this lab. 18 Copyright © Texas Education Agency, 2014. All rights reserved. Name______________________________________Date________________________Class_____________ Series Resistive Circuits Worksheet Directions: Fill in the blanks with the correct word or words. 1. A circuit is a complete ___________________ for current to flow. 2. Series resistive circuits have ___________________ in line end to end. 3. Series resistive circuits have only one ___________________ path. 4. Current flow through the circuit is the ___________________ at any point in the circuit. 5. Each resistor in the circuit has the same ___________________ flow through it. 6. The total resistance in the circuit is equal to the ___________________ of the individual resistors. 7. The sum of the individual voltages across the individual resistances is equal to the ___________________ voltage. Directions: Using the following circuit, fill in the blanks with the correct values. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. R =_______ T I = _______ T E =_______ T R =_______ 1 R =_______ 2 R =_______ 3 I =_______ 1 I =_______ 2 I =_______ 3 E =_______ 1 E =_______ 2 E =_______ 3 19 Copyright © Texas Education Agency, 2014. All rights reserved. Series Resistive Circuits Worksheet (Key) Directions: Fill in the blanks with the correct word or words. 1. A circuit is a complete _____path for current to flow. 2. Series resistive circuits have _ ___resistors ____ in line end to end. 3. Series resistive circuits have only one _____current __ path. 4. Current flow through the circuit is the _____same _ at any point in the circuit. 5. Each resistor in the circuit has the same _____current 6. The total resistance in the circuit is equal to the _____sum ___ flow through it. of the individual resistors. 7. The sum of the individual voltages across the individual resistances is equal to the ___source voltage. Directions: Using the following circuit, fill in the blanks with the correct values. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. R = T I = T E = T R = 1 R = 2 R = 3 I = 1 I = 2 I = 3 E = 1 E = 2 E = 3 100 Ω 1 amp 100 volts 56 Ω 33 Ω 11 Ω 1 amp 1 amp 1 amp 56 volts 33 volts 11 volts 20 Copyright © Texas Education Agency, 2014. All rights reserved. Name______________________________________Date________________________Class_____________ Series Resistive Circuit Quiz 1. Which of the following is considered to be a protection device? A Resistor B Fuse C Switch D Ground 2. Which of the following is a control device? A Resistor B Fuse C Switch D Ground 3. Which device opposes current? A Resistor B Capacitor C Inductor D Coil 4. Which of the following is the symbol for current? AA BV CΩ DI 5. The unit of resistance is which of the following? A Coulomb B Joule C Ohm D Ampere 6. An electrical load is A any weight being carried B any device represented by a resistor symbol C the amount of horsepower in a circuit D carrying a battery in your pocket 21 Copyright © Texas Education Agency, 2014. All rights reserved. Name______________________________________Date________________________Class_____________ 7. Every time you add a resistor to an existing series circuit, total resistance A subtracts B stays the same C adds D depends on polarity 8. Which law states that the algebraic sum of all voltages in a closed path is zero? A Voltage Divider Law B Ohm’s Law C Kirchhoff’s Law D Newton’s Law 9. In a series circuit, the ratio of the resistances equals the ratio of the __________? A current B voltage C conductance D capacitance 10. In the following circuit, label the polarity of voltage across each resistor. 11. In the following circuit, solve for the voltage drops across each resistor. 22 Copyright © Texas Education Agency, 2014. All rights reserved. Name______________________________________Date________________________Class_____________ 12. In the following circuit, solve for the voltage drops across each resistor. R = 250 Ω 1 V = R = 400 Ω S 2 12 V R = 150 Ω 3 13. In the following circuit, solve for the source voltage. R = 4 kΩ 1 R = 3.5 kΩ 2 V I = 3 mA S 2 R = 1.5 kΩ 3 14. In the following circuit, solve for the source voltage. R = 1.8 kΩ 1 R = 1.2 kΩ 2 V I = 3.6 mA S 2 V = 7.2 V 3 23 Copyright © Texas Education Agency, 2014. All rights reserved. Series Resistive Circuit Quiz (KEY) 1. Which of the following is considered to be a protection device? A Resistor B Fuse C Switch D Ground 2. Which of the following is a control device? A Resistor B Fuse C Switch D Ground 3. Which device opposes current? A Resistor B Capacitor C Inductor D Coil 4. Which of the following is the symbol for current? AA BV CΩ DI 5. The unit of resistance is the A Coulomb B Joule C Ohm D Ampere 6. An electrical load is A any weight being carried B any device represented by a resistor symbol C the amount of horsepower in a circuit D carrying a battery in your pocket 24 Copyright © Texas Education Agency, 2014. All rights reserved. 7. Every time you add a resistor to an existing series circuit, total resistance A subtracts B stays the same C adds D depends on polarity 8. Which law states that the algebraic sum of all voltages in a closed path is zero? A Voltage Divider Law B Ohm’s Law C Kirchhoff’s Law D Newton’s Law 9. In a series circuit, the ratio of the resistances equals the ratio of the __________? A current B voltage C conductance D capacitance 10. In the following circuit, label the polarity of voltage across each resistor. + + + + 11. In the following circuit, solve for the voltage drops across each resistor. 25 Copyright © Texas Education Agency, 2014. All rights reserved. 12. In the following circuit, solve for the voltage drops across each resistor. R = 250 Ω 1 V = 3.75 V V = 1 S 12 V V =6V 2 V = 2.25 V R = 400 Ω 2 3 R = 150 Ω 3 13. In the following circuit, solve for the source voltage. VS = 27 V R = 4 kΩ 1 R = 3.5 kΩ 2 V I = 3 mA S 2 R = 1.5 kΩ 3 14. In the following circuit, solve for the source voltage. VS = 18 V R = 1.8 kΩ 1 R = 1.2 kΩ 2 V I = 3.6 mA S 2 V = 7.2 V 3 26 Copyright © Texas Education Agency, 2014. All rights reserved.