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Household electricity is supplied to a pc's power supply module as alternating current (ac).

The power supply converts it into direct current (dc) at various voltages - such as +12V , +5V, etc. - which are then delivered to the pc's subsystems.

Some power supplies operate on 120 volts 60 Hz ac but others operate on 230 volts 50 Hz ac.

Which voltage your power supply uses depends on which country you are in.

For more information see the answers to the Related Questions shown below.

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13y ago

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