I have a 100w bulb, what supply voltage is required for it?


Either of the two common voltages can be used i.e. 230 volts or 120 volts. The wattage doesn't determine the voltage required.

Updated on February 1, 2018

Original Article:

Watts, Amps and Volts, Kilowatt Hours (kWh) and Electrical Appliances  - Basic Electricity Explained
By Eugene Brennan