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  4. The heat produced by a 100 W heater in 2 min. is equal to

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Q. The heat produced by a $100\, W$ heater in $2\, min$. is equal to

AIIMSAIIMS 1995Current Electricity

Solution:

Given: Power of heater $(P)=100\, W$ and time $(t)=2 \,\min =120\, sec$. We know that work done to produce heat $(W)=P \times t=100 \times 120=12000 \,J$
$=\frac{12000}{4 \cdot 2 \times 1000}=2 \cdot 8 \,kcal$