وزارة التـربية والتـعليــم قطاع العمليات المدرسية برنامج الدعم المدرسي العام الدراسي 2020-2019 A. Unit Four Review Series and Parallel Circuits 1 Q1: Chose the correct answer of the following questions. 1- Which of the following represent a series circuit? A. B. C. D. A circuit with only four paths of the current. A circuit with only three paths of the current. A circuit with only two paths of the current. A circuit with only one path of the current. 2- Which of the following is a correct description of the equivalent resistance in a series circuit? A. B. C. D. It is smaller than the smallest resistance in the circuit It is equal to tha largest resistance in the circuit. It is larger than the largest resistance in the circuit. It is equal to the smallest resistance in the circuit. 3- Which of the following is a correct description of the equivalent resistance in a parallel circuit? A. B. C. D. It is smaller than the smallest resistance in the circuit It is equal to tha largest resistance in the circuit. It is larger than the smallest resistance in the circuit. It is equal to the smallest resistance in the circuit. 4- Which ordaring correctly express the current in the brnches of the circuit in the figure ? A. B. C. D. 𝐼1 𝐼1 𝐼1 𝐼1 = 𝐼2 > 𝐼2 < 𝐼2 > 𝐼2 = 𝐼3 < 𝐼3 < 𝐼3 > 𝐼3 24 𝑉 2Ω 3Ω 6Ω 𝑅1 𝑅2 𝑅3 2 5- Which ordering correctly express the potential drop in the three 𝑅1 = 2Ω branches of the circuit in the figure? A. B. C. D. ∆𝑉1 = ∆𝑉2 = ∆𝑉3 ∆𝑉3 < ∆𝑉2 < ∆𝑉1 ∆𝑉3 > ∆𝑉2 > ∆𝑉1 ∆𝑉3 > ∆𝑉2 < ∆𝑉1 𝑅2 = 4Ω 𝑅3 = 6Ω 6- Three resistors are connected in series to a battery, how does the equivalent resistance change if the same resistors reconnected in parallel to the same battery? A. B. C. D. The equivalent resistance will not change. The equivalent resistance will decrease. The equivalent resistance will increase. The equivalent resistance will be zero. 7- Three resistors are connected in parallel to a battery, how does the equivalent resistance change if the same resistors reconnected in series to the same battery? A. B. C. D. The equivalent resistance will not change. The equivalent resistance will decrease. The equivalent resistance will increase. The equivalent resistance will be zero. 8- How does the current in the entire circuit shown in the figuge change when you add a new bulb in series to the circuit? A. B. C. D. The cureent will decrease. The current will increase. The current will stay the same. The current will be zero 3 9- How does the current in the entire circuit shown in the figuge change when you add a new bulb in parallel to the circuit? A. The cureent will decrease. B. The current will increase. C. The current will stay the same. D. The current will be zero. 10- From the figure below, if ( 𝑰𝟐 = 𝟒𝑨, 𝑰𝟑 = 𝟐𝑨, 𝑰𝟒 = 𝟏𝟐𝑨) determine the value of 𝑰𝟏 . A. B. C. D. 𝐼1 𝐼1 𝐼1 𝐼1 =3𝐴 =4𝐴 =5𝐴 =6𝐴 11- Which of the following staments is true? A. B. C. D. The resistance of a typical ammeter is very high. The resistance of a typical voltmeter is very low. Ammeters have zero resistance. A voltmeter causes a small change in current. 12- Which device contains an electronic circuit that detects small difference in current caused by an extra current path? A. B. C. D. Fuse. Circuit breaker. Ground-Fault interrupter. Ammeter. 13- What is the suitable fues to be placed in the position X, in the circuit shown in the figure? A. B. C. D. 5.0 A fues. 2.5 A fues. 2.0 A fues. 1.0 A fues. 30 𝑉 30 Ω 30 Ω 30 Ω 4 Q2: Solve the following problems 1- Refer to the figure to answer the following questions. A. What should the ammeter read? B. What should voltmeter 1 read? C. What should voltmeter 2 read? ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 2- Ammeter 1 in the Figure reads 0.20 A. A. What should ammeter 2 indicate? B. What should ammeter 3 indicate? C. What is the battery potential difference? ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ………………………………………………………………………………………………………………. 5 3- As shown in the figure, the battery develops 110 V. A. What will ammeter 1 read? B. What will ammeters 2,3,4 read? ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 4- Refer to the Figure to answer the following questions. A. Determine the total resistance. B. Determine the current throuh the 25 Ω resistor. ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 6
