Q. The heating coils rated at $220\ volt$ and producing $50\ cal/sec$ heat are available with the resistance $55\ \Omega,\ 110\ \Omega,\ 220\ \Omega\ $and$\ 440\ \Omega.$ The heater of maximum power will be of
A) $440\ \Omega$
B) $220\ \Omega$
C) $110\ \Omega$
D) $55\ \Omega$
Explanation
(d) $\frac{H}{t} = \frac{V^{2}}{R} \Rightarrow \frac{H}{t} \propto \frac{1}{R}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.