Physics - Current Electricity Question with Solution | TestHub

A heater is designed to operate with a power of $1000\mathrm{W}$ in a $100\mathrm{V}$ line. It is connected in combination with a resistance of $10\Omega$ and a resistance $R$, to a $100\mathrm{V}$ mains as shown in figure. For the heater to operate at $62.5\mathrm{W}$, the value of $\mathrm{R}$ should be _____$\Omega$.