MDCAT Physics MCQ #27

A step-down transformer has a primary voltage of 220 V and a secondary voltage of 110 V. If the primary current is 1 A, what is the secondary current?

MDCAT Physics MCQ #27

  1. Question 1

    Q1. A step-down transformer has a primary voltage of 220 V and a secondary voltage of 110 V. If the primary current is 1 A, what is the secondary current?

    • A) 1 A
    • B) 2 A
    • C) 3 A
    • D) 4 A

    Answer: 2 A

    Explanation: For an ideal transformer, I_primary * V_primary = I_secondary * V_secondary. So, I_secondary = I_primary * (V_primary / V_secondary) = 1 A * (220 V / 110 V) = 2 A. Option A is incorrect because it assumes equal current in primary and secondary.