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NEET2026PhysicsChapterActual

An ideal step-down transformer is used to operate a low-voltage AC motor. The motor is connected to the secondary coil and draws a steady current of 5 A at 24 V . If the current measured in the primary coil is 0.5 A , what is the voltage of the AC mains supplying the primary coil?

Options

  1. A120 V
  2. B240 V
  3. C48 V
  4. D2.4 V

Correct answer

B. 240 V

Step-by-step solution

For an ideal transformer, the input power is equal to the output power. V_p I_p = V_s I_s Substituting the given values: V_p 0.5 = 24 5 V_p 0.5 = 120 V_p = 120 0.5 = 240 V Answer: 240 V

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