Current Electricity - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1979

An electrical circuit is connected up as shown above, which of the following is correct about the value of current flowing through the 1 ohm resistance?

A. 12/13A
B. 13/12A
C. 1/3A
D. 3A
E. 12/7A

Question 12:

• JAMB 1980

A milliameter of resistance 5\(\Omega\) and full scale deflection of 5m A is to used to measure a potential difference of 50 V. The resistance of the multiplier should be

A. 95\(\Omega\)
B. 110\(\Omega\)
C. 595\(\Omega\)
D. 995\(\Omega\)
E. 1005\(\Omega\)

Question 13:

• JAMB 1980

A cell has an open circuit voltage V₁ and a closed circuit voltage V₂ when a current is flowing through it. Therefore, the internal resistance of the cell is

A. \(\frac{V_2}{I}\)
B. \(\frac{V_1}{I}\)
C. \(\frac{(V_1 + V_2)}{I}\)
D. \(\frac{(V_1 - V_2)}{I}\)
E. \(\frac{(V_2 - V_1)}{I}\)

Question 14:

• JAMB 1980

According to Ohm's law, the ratio V/I is constant for

A. An electrolyte
B. A diode
C. A transistor
D. Silver
E. All of the above

Question 15:

• JAMB 1980

What is the total resistance in the above diagram

A. 5 ohms
B. 15 ohms
C. 25 ohms
D. 35 ohms
E. 45 ohms