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