Physics 21
Practice Quiz#7
Name _____________________
b 1. (2pts)
The rate of heat dissipation in an AC circuit with resistance, R, and effective current, Irms, is given by
which of the following
a. 0.5  (Irms)2R
b. (Irms)2R
c. 2.0  (Irms)2R
d. 4.0  (Irms)2R
c 2. (2pts) What is the effective (rms) current value for an AC current with an amplitude of 10 A?
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a. 28 A
b. 3.1 A
c. 7.1 A
d. 14 A
a 3. (2pts) An AC voltage source, with a peak output of 200 V, is connected to a 50- resistor. What is the effective (or
rms) current in the circuit?
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a. 2.8 A
b. 4.0 A
c. 5.6 A
d. 2.0 A
c 4. (2pts) In an AC series circuit the capacitive reactance is 200  and frequency is 100 Hz. What is the capacitance?
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a. 3.2 F
b. 6.28 F
c. 8.0 F
d. 50.0 F
b 5. (2pts) In the inductor of a 60-Hz AC series circuit, the peak voltage precedes the peak current in each cycle by what
time interval?
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a. 2.1  103 s
b. 4.2  103 s
c. 8.3  103 s
d. 1.7  103 s