Q. In an ideal transformer the number of turns of primary and secondary coil is given as 100 and 300 respectively. If the power input is $60\ W$, the power output is
A) $100\ W$
B) $300\ W$
C) $180\ W$
D) $60\ W$
Explanation
(d) Efficiency of a transformer,
$\eta = \frac{Power\ output}{Power\ input}$
For an ideal transformer, $\eta = 1$
$\therefore$ Power output = Power input $= 60\ W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.