# Aljalal-Phys102-131-Ch27-page 1 Questions Chapter 27 Circuits Aljalal-Phys102-131-Ch27-page 2

Aljalal-Phys102-131-Ch27-page 1 Questions Chapter 27 Circuits Aljalal-Phys102-131-Ch27-page 2 27-3 Calculating The Current In a Single-Loop Circuit

An electrical source with internal resistance r = 2.0 Ohm is used to operate a lamp of resistance R = 18 Ohm. What fraction of the total power is delivered to the lamp? A) B) C) D) E) 0.5.

1.8. 0.8. 0.2. 0.9. Answer E Aljalal-Phys102-131-Ch27-page 3 27-3 Calculating The Current In a Single-Loop Circuit

Aljalal-Phys102-131-Ch27-page 4 27-5 Resistances in Series and Parallel Fig 1 shows two resistors 3.0 and 1.5 connected in parallel and the combination is connected in series to a 4.0 resistor and a 10 V emf device. The potential difference Va - Vb is: A) 2.0 V B) 6.0 V

C) 8.0 V D) 10 V E) 12 V Answer A Aljalal-Phys102-131-Ch27-page 5 27-5 Resistances in Series and Parallel

Aljalal-Phys102-131-Ch27-page 6 27-5 Resistances in Series and Parallel The four resistors shown in Figure 5 are identical, and each has a resistance of 6.0 . The battery is ideal and has emf E = 12 V. What is the value of the current i2 passing through R2? A) 2.5 A B) 1.0 A C) 1.5 A D) 2.0 A

E) 0.50 A Answer E Aljalal-Phys102-131-Ch27-page 7 27-5 Resistances in Series and Parallel Aljalal-Phys102-131-Ch27-page 8

27-5 Resistances in Series and Parallel In the circuit shown in Figure 8, what power is dissipated in the 4- resistor? A) 16 W B) 8.0 W C) 24 W D) 12 W E) 20 W Answer A

Aljalal-Phys102-131-Ch27-page 9 27-5 Resistances in Series and Parallel Aljalal-Phys102-131-Ch27-page 10 27-6 Multiloop Circuits For the circuit shown in Figure 4, which equation is correct for loop 2? A) E2 + R3I3 + E3 - R2I2 = 0 B) E2 + R3I3 - E3 + R2I2 = 0

C) E2 - R3I3 - E3 - R2I2 = 0. D) E2 + R3I3 + E3 + R2I2 = 0 E) -E2 + R3I3 - E3 + R2I2 = 0 Answer B Aljalal-Phys102-131-Ch27-page 11 27-6 Multiloop Circuits In the circuit shown in Figure 6, E1 = 6.00 V, E2 = 12.0 V, R1 = 200 , and R2 =

100 . What is the power supplied by E1? (Consider the two emf to be ideal). A) 1.08 W B) 0.720 W C) 3.24 W D) 2.88 W E) 1.80 W Answer A Aljalal-Phys102-131-Ch27-page 12

27-6 Multiloop Circuits Aljalal-Phys102-131-Ch27-page 13 27-7 RC Circuits A certain capacitor, C, in series with a resistor, R, is being charged. At the end of 10 ms its charge is half the maximum value. The time constant of the RC circuit is: A) 2.3 ms

B) 14 ms C) 6.9 ms D) 10 ms E) 43 ms Answer B Aljalal-Phys102-131-Ch27-page 14 27-7 RC Circuits

Aljalal-Phys102-131-Ch27-page 15 27-7 RC Circuits The capacitor shown in Figure 14 is initially charged. Switch S is closed at time t = 0. At the end of 10.0 ms, the charge on the capacitor is one third the initial value. The time constant of this circuit is: A) 9.10 ms B) 3.33 ms C) 30.0 ms

D) 24.7 ms E) 4.05 ms Answer A Aljalal-Phys102-131-Ch27-page 16 27-7 RC Circuits

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