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

Question 11:

• JAMB 2001

In the diagram above, determine the r.m.s current

A. 31A
B. 48A
C. 60A
D. 80A

Question 12:

• JAMB 2003

When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

A. 1200W
B. 600W
C. 120W
D. 30W

Question 13:

• JAMB 2004

An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is

A. 1.4A
B. 1.2A
C. 12.0A
D. 14.0A

Question 14:

• JAMB 2004

In a tuned radio receiver R, L, C series circuit for resonance, the inductive and capacitive reactance X_L and X_C respectively are related as

A. X_L = X_C
B. X_L = ¹/₂X_C
C. X_L = ¹/_X[sub]C[/sub]
D. X_L = 2X_C

Question 15:

• JAMB 2004

The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is

A. 9.0 x 10^-3J
B. 9.0 x 10^-2J
C. 1.4 x 10^-2J
D. 1.8 x 10^-3J