Current Electricity - Jamb Physics Past Questions and Answers

Question 111:

• JAMB 2011

In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing through the 12Ω resistors is

A. 14.4 A
B. 1.0 A
C. 3.2 A
D. 9.6 A

Question 112:

• JAMB 2012

Four cells each of e.m.f 1.5V and internal resistance of 4Ω are connected in parallel. What is the effective e.m.f. and internal resistance of the combination?

A. 6.0V, 16Ω
B. 6.0V, 1Ω
C. 1.5V, 4Ω
D. 1.5V, 1Ω

Question 113:

• JAMB 2012

A cell of internal resistance 0.01Ω can be measured accurately using the

A. Ohm meter
B. Metre bridge
C. Potentiometer
D. Electroscope

Question 114:

• JAMB 2012

A cell of internal resistance r supplies current to a 6.0Ω resistor and its efficiency is 75%. Find the value of r.

A. 4.5Ω
B. 1.0Ω
C. 8.0Ω
D. 2.0Ω

Question 115:

• JAMB 2012

A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value.
The value of R is

A. 3 Ω
B. 2 Ω
C. 1 Ω
D. 6 Ω