Current Electricity - Jamb Physics Past Questions and Answers

Question 16:

• JAMB 1981

Which of the following is NOT an effect that can be produced by an electric current?

A. Heat
B. Light
C. Sound
D. Motion
E. None of the above

Question 17:

• JAMB 1981

A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps to a resistance whose value is

A. 0.5\(\Omega\)
B. 1\(\Omega\)
C. 2\(\Omega\)
D. 2.5\(\Omega\)
E. 3\(\Omega\)

Question 18:

• JAMB 1981

The resistance of a 240V, 60 watt electric filament bulb is

A. 0.25\(\Omega\)
B. 480\(\Omega\)
C. 60\(\Omega\)
D. 240\(\Omega\)
E. 960\(\Omega\)

Question 19:

• JAMB 1981

The resistance of an open series circuit is

A. Zero
B. Half the normal resistance of the circuit
C. Double the normal resistance of the circuit
D. One
E. Infinite

Question 20:

• JAMB 1981

If I is the current passing through a metallic resistor and H is the rate of Heat generated in the resistor at a constant temperature, then

A. H \(\alpha\) \(\frac{1}{I}\)
B. H \(\alpha\) \(\frac{1}{I^2}\)
C. H \(\alpha\) \(\sqrt1\)
D. H \(\alpha\) I²
E. None of the above