What happens when 240 volt equipment is plugged into a 120 volt source or if 110-120 volt equipment is plugged into a 60 volt source assuming all alternating current?

Assuming all alternating current and all at the same or similar frequency (say, 50-60Hz), nothing much will happen on a device using a linear transformer. A linear transformer (one that is made of core and coils) will produce half its nominal output voltage, which is unlikely to meet the requirements of the circuitry following that transformer With a switched-mode power supply, results will vary subject to the power supply design. The attached circuitry is unlikely to work within its specifications, but you may find that it works under light load The short answer is that normally the power taken - and the resultant power output - would be only one quarter of the power at the equipment's rated voltage However some small electrical appliances - such as electric shavers, etc.- have been designed to run safely on different supply voltages whilst using and outputting almost the same amount of power.

The appliance's rating plate will state the range of suitable voltages Such small, low-wattage, appliances or electronics items work in that way because they contain some built-in converter circuitry having semiconductors, transformers and resistors, etc. This is why you can plug such low-wattage appliances or electronics items into your wall and not have them "fry"... The built in converter circuitry converts the supply voltage to the right level A detailed answer If you tried to use something that was designed for 240 volts on only 120 volts, or 110-120 volt equipment at only 60 volts, the result is not that you would get half the power output: y ou would get only a quarter! That is because of Ohms Law, which says: Amps = volts divided by resistance (ohms) and the Power Law which says: Power (watts) = volts multiplied by amps so it is also true to say: Power = volts x ( volts / ohms ) or V 2 ohms If the appliance was designed to run on 240 volts, with a certain number of ohms of resistance, its power is given by the formula as: Power = 240 x 240 / ohms = 57600 / ohms So, if the resistance of the appliance is 5 ohms its power consumption is 57600 / 5.

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