Lamps use whatever voltage they are designed to run on. If the question as asking about the energy used, this is measured in watts. Watts are calculated as: W (watts) = V (volts) x I (amps) which is...
The voltage at which a refrigerator works depends on country to country. For example. In my country, India all the electronics works in the voltage range of 230-240V. In USA it is around 110V. It...