Answer:
It is very important to supply any device with a voltage in the range it is designed for. For example, connecting a device that is designed for 110V to a 230V supply can be very dangerous. There is the risk of burning, fire or even explosion. It should not be assumed that connecting a higher voltage (220-240V) device to a low voltage supply (110V) is risk free, although certainly less dangerous than the other way round.
