Current Electricity - Jamb Physics Past Questions and Answers

Question 76:

• JAMB 1995

An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced

A. 0.5kJ
B. 8.0kJ
C. 20.0kJ
D. 40.0kJ

Question 77:

• JAMB 1997

Three electric cells each of e.m.f 1.5V and internal resistance of 1.0\(\Omega\) are connected in parallel across an external resistance of \(\frac{2}{3}\)\(\Omega\). Calculate the value of the current in the resistor

A. 0.5 A
B. 0.9A
C. 1.5A
D. 4.5A

Question 78:

• JAMB 1997

In a meter bridge experiment, two resistor 2\(\Omega\) and 3\(\Omega\) occupy the left and right gaps respectively. Find the balance point from the left side of the bridge

A. 20cm
B. 40cm
C. 60cm
D. 80cm

Question 79:

• JAMB 1998

The total resistance measured at PQ in the diagram above is

A. 18.0Ω
B. 11.0Ω
C. 4.0Ω
D. 2.0Ω

Question 80:

• JAMB 1999

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