Ten $60 \,W , 220 \,V$ bulbs are connected in series to $220 \,V$ supply. Power consumed in the circuit is ......... $W$
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(a)
$P=\frac{V^2}{R}$
$R=\frac{V^2}{P}=\frac{(220)^2}{60}$
$P_{\text {Toosl }}=\frac{V^2}{R_{\text {eq }}}=\frac{(220)^2}{10(220)^2} \cdot 60=6\,W$
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