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

Question 36:

• JAMB 2012

The current through a resistor in an a.c circuit is given as 2 sin wt. Determine the d.c. equivalent of the current

A. A/√2
B. 2/√A
C. 2 A
D. √2 A

Question 37:

• JAMB 2012

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

A. 90°
B. 60°
C. 0°
D. 180°

Question 38:

• JAMB 2015

The r.m.s value of a supply voltage is quoted at 200v. What is the approximate peak value of the voltage?

A. 200volts
B. 300volts
C. 283volts
D. 250volts

Question 39:

• JAMB 2016

Which of the following instruments can be used to measure current in an a.c circuit?

A. Hot wire ammeter
B. Moving coil ammeter
C. Tangent galvanometer
D. Moving coil galvanometer

Question 40:

• JAMB 2017

When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is

A. 240v
B. 340v
C. 480v
D. 57600v