A battery of emf 24 V is connected to a 6- $\Omega$ resistor.As a result, current of 3 A exists in the resistor.The terminal potential difference of the battery is:
A)0 V
B)6 V
C)12 V
D)18 V
E)24 V

Question

Quizplus · Accepted Answer

Using Ohm's law, we know that V = IR, where V is the potential difference across the resistor, I is the current passing through the resistor, and R is the resistance of the resistor. In this case, we have I = 3 A and R = 6 Ω. Therefore, V = (3 A)(6 Ω) = 18 V. Since the emf of the battery is 24 V, the terminal potential difference of the battery is 24 V - 18 V = 6 V. Therefore, the correct answer is (D), 18 V.

A Battery of Emf 24 V Is Connected to a 6-