WAEC Physics 2014 Objective — Question 43

Question 43 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.

In the circuit diagram, E is a battery of negligible internal resistance. If its emf is 9.0V, calculate the current in the circuit.

• A. 1.8 A
• B. 1.0 ACorrect
• C. 0.8 A
• D. 0.3 A

Explanation

The parallel combination of 5Ω and 20Ω gives 4Ω; adding the series 5Ω gives a total of 9Ω. Current = E/R = 9.0V/9Ω = 1.0A.

Advertisement