PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
15. The emf of a battery is 12 volts. When the battery delivers a current of 0.5 ampere to a load, the potential difference between the terminals of the battery is 10 volts. The internal resistance of the battery is
(A) 1Ω
(B) 2Ω
(C) 4Ω
(D) 20Ω
(E) 24Ω