Question

The above circuit diagram shows a battery with an internal resistance of 4.0 ohms connected to a 16–ohm and a 20–ohm resistor in series. The current in the 20–ohm resistor is 0.3 amperes

What is the emf of the battery?

(A) 1.2 V

(B) 6.0 V

(C) 10.8 V

(D) 12.0 V

(E) 13.2 V

Answer 1

The correct option is: (D) 12.0 V

Explanation:

Total circuit resistance (including internal resistance) = 40 Ω; total current = 0.3 A. E = IR.