Solution:
We know,
This would be possible only when is in series with the bulb resistance because in that case both resistances will share equal potential difference of 100 V each.
An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200 volts supply. The resistance R that must be put in series the bulb, so that the bulb delivers 500 watt is …… ohm.
We know,
This would be possible only when is in series with the bulb resistance because in that case both resistances will share equal potential difference of 100 V each.