Ohm's law - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1987

A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?

A. 1200J
B. 1500J
C. 2400J
D. 96000J

Question 12:

• JAMB 1987

In the above, a voltage V is applied across the terminals P and Q. The voltage across the 1 ohm resistor is

A. V/8
B. V/4
C. V/3
D. V/2

Question 13:

• JAMB 1988

In the circuit diagram above, the ammeter reads a current of 3A when R is 5 ohms and 6A when R is 6 ohms,the value of the unknown resistance X is

A. 1
B. 2
C. 3
D. 4

Question 14:

• JAMB 1989

Three resistors, with substances 250\(\Omega\), 500\(\Omega\) and 1k\(\Omega\) are connected in series. A 6V battery is connected to either end of the combination. Calculate the pot3ential difference between the end of the 250\(\Omega\) resistor.

A. 0.20V
B. 0.86V
C. 1.71V
D. 3.43V

Question 15:

• JAMB 1989

An ammeter of resistance 1.0\(\Omega\) has a full-scale deflection of 50mA. Determine the resultant full-scale deflection of the meter when a shunt of 0.0111\(\Omega\) is connected across its terminals.

A. 400mA
B. 450mA
C. 500mA
D. 550mA