An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance $R$ that must be put in series with the bulb so that the bulb delivers the same power is \_\_\_\_ $\Omega$.
An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance $R$ that must be put in series with the bulb so that the bulb delivers the same power is \_\_\_\_ $\Omega$.