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Question

Question: An electric heater of resistance 6 ohm is run for 10 minutes on a 120 volt line. The energy liberate...

An electric heater of resistance 6 ohm is run for 10 minutes on a 120 volt line. The energy liberated in this period of time is

A

7.26mu×6mu1036muJ7.2\mspace{6mu} \times \mspace{6mu} 10^{3}\mspace{6mu} J

B

14.4×6mu1056muJ14.4 \times \mspace{6mu} 10^{5}\mspace{6mu} J

C

43.26mu×6mu1046muJ43.2\mspace{6mu} \times \mspace{6mu} 10^{4}\mspace{6mu} J

D

28.86mu×6mu1046muJ28.8\mspace{6mu} \times \mspace{6mu} 10^{4}\mspace{6mu} J

Answer

14.4×6mu1056muJ14.4 \times \mspace{6mu} 10^{5}\mspace{6mu} J

Explanation

Solution

By using H=V2tRH = \frac{V^{2}t}{R}

H=(120)2×10×606=14.4×105JH = \frac{(120)^{2} \times 10 \times 60}{6} = 14.4 \times 10^{5}J