Ohm's law - Jamb Physics Past Questions and Answers

Question 16:

• JAMB 1990

Three cells each of e.m.f. 1.5v and an internal resistance of 1.0\(\Omega\) are connected in parallel across a load resistance of 2.67\(\Omega\). Calculate the current in the load?

A. 0.26A
B. 0.41A
C. 0.50A
D. 0.79A

Question 17:

• JAMB 1990

A lamp is rated 240V, 60W. The resistance of the filament is

A. 960\(\Omega\)
B. 16\(\Omega\)
C. 15\(\Omega\)
D. 4\(\Omega\)

Question 18:

• JAMB 1991

Which of the following obeys Ohm's Law?

A. Glass
B. Diode
C. All electrolytes
D. All metals

Question 19:

• JAMB 1991

Th internal resistance of each of the cells E1 and E2 Shown in the figure above is 2 Ohm. Calculate the total current in the circuit

A. 0.80A
B. 0.50A
C. 0.40A
D. 0.004A

Question 20:

• JAMB 1993

A 40-W instrument has a resistance of 90\(\Omega\). On what voltage should it be operated normally?

A. 60V
B. 150V
C. 225V
D. 3600V