Efficiency of a transformer is equal to?

A. Efficiency of transformer = (secondary coil ÷ primary coil) × 100%
B. Efficiency of transformer = (mechanical advantage ÷ velocity ratio) × 100%
C. Efficiency of a transformer = (Number of turns in the secondary coil ÷ Number of turns in the primary coil) × 100%
D. Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%

Correct Answer:

Option D – Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%

Explanation

Efficiency of a transformer = (power developed in the secondary coil ÷ power supplied to the primary coil) × 100%