Current Electricity - Jamb Physics Past Questions and Answers

Question 71:

• JAMB 1994

Two capacitors R₁ = 4\(\Omega\) and R₂ = 5\(\Omega\) are connected in parallel across a potential difference. If P₁ and P₂ represent power dissipated in R ₁ and R₂ respectively, then the ratio P₁ : P₂ is

A. 4 : 5
B. 5 : 4
C. 16 : 25
D. 25 : 16

Question 72:

• JAMB 1994

In the fig above, XY is of length 1m, The value of R at balance point Z is

A. 3.0Ω
B. 13.3Ω
C. 15.0Ω
D. 30.0Ω

Question 73:

• JAMB 1994

In the circuit diagram above, calculate the current in the 12 Ω resistor if the cell has an emf of 12V and an internal resistance of 1Ω

A. 0.8A
B. 1.0A
C. 1.6A
D. 2.4A

Question 74:

• JAMB 1995

If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is

A. 1 : 6
B. 1 : 3
C. 2 : 1
D. 6 : 1

Question 75:

• JAMB 1995

A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is

A. 16.0A
B. 8.0A
C. 0.8A
D. 0.4A