Physics - Current Electricity Question with Solution | TestHub

Bulbs are connected in parallel and they totally consume$110\mathrm{ W}$at$220 \mathrm{V}$

Net power,$P_{\mathrm{n}\mathrm{e}\mathrm{t}}=P_1+P_2$

$P+P=110 \mathrm{W} \left\{\because P_1=P_2=P\right\}$

$2P=110\mathrm{ W}\Rightarrow P=55\mathrm{ W}$

We know that,

$P=\frac{V^2}{R}$

$55=\frac{{\left(220\right)}^2}{R}$

$R=\frac{{\left(220\right)}^2}{55}=\frac{220\times 220}{55}=880 \mathrm{\Omega }$