Question

The efficiency of an ideal transformer is:

• A. \(25%\)
• B. \(50%\)
• C. \(75%\)
• D. \(100%\)

Hint:

Practical transformers always have efficiency less than \(100%\) due to energy losses.

Answer 1

The Correct Option is D

Concept: Efficiency of transformer: \[ \eta= \frac{\text{Output Power}} {\text{Input Power}} \times100 \] An ideal transformer has:

• No flux leakage
• No copper loss
• No hysteresis loss
• No eddy current loss

Step 1: Understand ideal transformer. In ideal transformer: \[ P_{in}=P_{out} \] Thus: \[ \eta= \frac{P_{out}}{P_{in}}\times100 = 100% \]

Step 2: Final answer. \[ \boxed{ 100% } \]