MDCAT Physics MCQ #452

A battery has an emf of 12 V and an internal resistance of 0.5 ohm. When connected to an external resistance of 2.5 ohm, what is the current?

MDCAT Physics MCQ #452

  1. Question 1

    Q1. A battery has an emf of 12 V and an internal resistance of 0.5 ohm. When connected to an external resistance of 2.5 ohm, what is the current?

    • A) 2 A
    • B) 4 A
    • C) 3 A
    • D) 6 A

    Answer: 4 A

    Explanation: Using the formula I = E/(R + r), we get I = 12/(2.5 + 0.5) = 4 A. Option A is incorrect because it miscalculates the total resistance.