MDCAT Physics MCQ #457

A cell has an emf of 2 V and internal resistance 1 ohm. When connected to an external resistance of 3 ohm, what is the terminal voltage?

MDCAT Physics MCQ #457

  1. Question 1

    Q1. A cell has an emf of 2 V and internal resistance 1 ohm. When connected to an external resistance of 3 ohm, what is the terminal voltage?

    • A) 1.5 V
    • B) 1 V
    • C) 2 V
    • D) 1.2 V

    Answer: 1.5 V

    Explanation: First, find the current I = E/(R + r) = 2/(3 + 1) = 0.5 A. Then, the terminal voltage V = E - Ir = 2 - 0.5 * 1 = 1.5 V. Option C is incorrect because it ignores the internal resistance.