Verified Solution • 2025–26 Session moderate

QJEEM18Ph560a: JEE Main 2018 Physics - Class 12 JEEM18Ph560a Solution: A power transmission line feeds input power at 2300 V to a step …

A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns, giving the output power at 230 V. If the current in the primary of the transformer is 5 A, and its efficiency is 90%, the output current would be ;

Multiple Choice Options

  • A 50 A
  • B 45 A
  • C 25 A
  • D 20 A

Step-by-Step Verified Solution

Efficiency n = 0.9 = PsPp

as P = VI

∴ Ps = 0.9 × Pp

⇒ Vs Is = 0.9 × Vp Ip

⇒ Is = 0.9×2300×5230

= 45 A

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