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NEET 2026
Exam
NEET
Year
2026
Subject
Physics
Chapter
Chapter

NEET 2026 · Physics · Chapter

An ideal step-down transformer is used to operate a low-voltage AC...

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 A5\text{ A} at 24 V24\text{ V}. If the current measured in the primary coil is 0.5 A0.5\text{ A}, what is the voltage of the AC mains supplying the primary coil?

Options

  1. A120 V120\text{ V}
  2. B240 V240\text{ V}
  3. C48 V48\text{ V}
  4. D2.4 V2.4\text{ V}

Correct answer

B. 240 V240\text{ V}

Step-by-step solution

For an ideal transformer, the input power is equal to the output power.

VpIp=VsIsV_p I_p = V_s I_s

Substituting the given values:

Vp×0.5=24×5V_p \times 0.5 = 24 \times 5

Vp×0.5=120V_p \times 0.5 = 120

Vp=1200.5=240 VV_p = \dfrac{120}{0.5} = 240\text{ V}

Answer: 240 V240\text{ V}
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