Q. In an electric heater $4\ amp$ current passes for $1\ minute$ at potential difference of $250\ volt,$ the power of heater and energy consumed will be respectively
A) $1\ kW,\ 60\ kJ$
B) $0.5\ kW,\ 30\ kJ$
C) $10\ kW,\ 600\ kJ$
D) None of these
Explanation
(a) Power $P = VI = 250 \times 4 = 1000W = 1kW$
Energy $= P \times t = 1\ kW \times 60\ sec = 60\ kJ$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.