Simple A. C. Circuits - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1997

The voltage of the domestic electric supply is represented by the equation V = 311 sin314.2t. Determine the frequency of the a.c. supply [\(\pi\) = 3.142]

A. 50.0Hz
B. 100.0Hz
C. 311.0Hz
D. 314.2Hz

Question 7:

• JAMB 1999

in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?

A. 30V
B. 40V
C. 50V
D. 70V

Question 8:

• JAMB 2000

In the a.c circuit above, the current value is

A. 0.58 A
B. 3.00 A
C. 4.00 A
D. 6.67 A

Question 9:

• JAMB 2001

At reasonance, the phase angle in an a.c. circuit is

A. 90°
B. 60°
C. 0°
D. 180°

Question 10:

• JAMB 2001

A capacitor of 20 x 10^-12F and an inductor are joined in series. The value of the inductance that will give the circuit a resonance frequency of 200kHz is

A. I/16 H
B. I/8 H
C. I/64 H
D. I/32 H