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A current flows in a wire of resistance 5 ohm having potential difference 7 volt for 20 minutes. The heat produced is?

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A current flows in a wire of resistance 5 ohm having potential difference 7 volt for 20 minutes. The heat produced is?

A) 140 cal 

B) 280 cal 

C) 700 cal 

D) 2800 cal

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The correct option is D) 2800 cal.

Heat generated

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49/5x20x60 = 11760 J
= 11760/4.2 = 2800 cal
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