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  4. A hot electric iron has a resistance of 80 Ω and is used on a 200 V source. The electrical energy spent, if used for 2h, is

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Q. A hot electric iron has a resistance of $ 80\,\Omega $ and is used on a $200 \,V$ source. The electrical energy spent, if used for $2h$, is

ManipalManipal 2014

Solution:

The resistance, $R=80\, \Omega$
Voltage, $V =200\, V$
$t =2 h$
The relation for power is given by $D=P=\frac{V^{2}}{R}$
$=\frac{(200)^{2}}{80}=500 \,W$
The energy spent
$=$ power $\times$ time
$=500 \times 2=1000 \,Wh$