Basic Electricity and Electronics Module One – Terms and Definitions 1. Coulomb – is the unit of electrical charge 2. ( R ) Resistance – is the opposition to current flow. Measured in Ohms 3. (I) Current – is the movement of electrons (Coulombs per sec). Measured in Amps 4. ( V ) Voltage - – is a potential difference between two points. Measured in Volts 5. ( J ) Joule - is a unit of work or energy. Measured in Joules 6. Power – work or energy per unit of time. (Joules per second). Measured in Watts Basic Electricity and Electronics Module One – Quiz 1. Which device resists direct current? a. b. c. d. Resistor Capacitor Inductor Coil 2. Which of the following is a control device? a. b. c. d. Resistor Switch Fuse Ground 4. Which of the following is the symbol for current? a. A b. V c. Ω d. I Copyright © Texas Education Agency, 2012. All rights reserved. 1 7. A a/an: a. b. c. d. volt is Potential difference between two points Unit of charge on an electron Rate of flow of charge Opposition to current flow 8. How many forms of Ohm’s Law are there? a. b. c. d. One Two Three Four 9. Energy is: a. b. c. d. The The The The fundamental ability to do work rate at which energy is used amount when one joule is used in one second maximum amount of power dissipated without damage 11. An electrical load is: a. b. c. d. Any weight being carried The amount of horsepower in a circuit Any resistive element connected to a power supply Taking more than four classes a semester 12. Which of the following is a unit of power? a. b. c. d. Joule Joule per second Joule-second Volt-ohm 13. When the voltage across a resister is doubled, the current will: a. b. c. d. Triple Halve Double Not change 14. When the resistance in a circuit is doubled, the current will: a. b. c. d. Triple Halve Double Not change Copyright © Texas Education Agency, 2012. All rights reserved. 2 17. What performs the work in an electric circuit? a. b. c. d. Heat Voltage A resistor Current 18. What is the definition of current? a. b. c. d. The movement of electrons Force created by the buildup of charge Force times distance A twisting or rotary force 19. What is the definition of voltage? a. b. c. d. The movement of electrons Force created by the buildup of charge Force times distance A twisting or rotary force 20. What is resistance? a. b. c. d. The interaction of two magnetic fields Conversion of mechanical energy into electrical energy An imbalance between electrons and protons The opposition to current flow 21. What is the formula for Ohm’s Law? a. b. c. d. P=VI I=V/R F=MA I = V2 R 24. The unit of resistance is the: a. b. c. d. Coulomb Joule Ampere Ohm 25. The unit of electrical charge is the: a. b. c. d. Coulomb Joule Ampere Ohm Copyright © Texas Education Agency, 2012. All rights reserved. 3 26. A circuit has a 12 V power supply and a 1 kΩ resistor. What is the current? 27. A circuit has a 42 kΩ resistor and 8 mA of current. What is the voltage? 28. A circuit has 520 milli amps of current and 240 volts. What is the resistance? 30. A circuit has 470 kΩ and 16 V. What is the current? 31. I = 145 mA, R = 10 MΩ. V = ? 32. In the following circuit calculate current and voltage drops. R1 = 2 KΩ VS = 12V R2 = 4 KΩ Copyright © Texas Education Agency, 2012. All rights reserved. 4 33. In the following circuit, calculate total current and total resistance. VS = 18V R2 = 4kΩ R1 = 2kΩ 34. In the following circuit, what is R1? R1 VS = 12V R2 = 4 KΩ I = 1 mA 36. What is R2 in the following circuit? IT = 12 mA VS = 18V R1 = 2kΩ R2 = ? Copyright © Texas Education Agency, 2012. All rights reserved. 5