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For an efficient step down transformer:

Correct answer: C. Input power is same as the output power

  • A. Voltage in primary and secondary are equal
  • B. Current in primary and secondary are equal
  • C. Input power is same as the output power
  • D. Output power is zero

Explanation

A step-up transformer is one that increases voltage, whereas a step-down transformer decreases voltage.Assuming, as we have, that resistance is negligible, the electrical power output of a transformer equals its input.

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