Q. Two identical electric lamps marked $500\ W,\ 220\ V$ are connected in series and then joined to a $110\ V$ line. The power consumed by each lamp is
A) $\frac{125}{4}W$
B) $\frac{25}{4}W$
C) $\frac{225}{4}W$
D) $125\ W$
Explanation
(a) Voltage across each bulb $V^{'} = \frac{110}{2} = 55W$ so, power consumed by each bulb will be
$P^{'} = \left( \frac{55}{220} \right)^{2} \times 500$
$= \frac{125}{4}W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.