Monday, February 7, 2011

AC Alternating Current

Alternating Current is electrical current that reverses the direction in which it is flowing at regular intervals and changes amplitude constantly.

This is the type of current supplied by the electric company.

In the United States, outlets supply between 110 and 120 VAC at 60 Hz.

The rest of the world uses between  220 and 240 VAC at 50 Hz.

Most computer components, however, require direct current (DC).

The Power Supply converts AC into usable 12, 5, or 3.3 VDC.

The IEC 320 connector on the back of the power supply connects to the electrical outlet.

The AC Adapter supplies a laptop with power by converting AC into DC and recharging the battery.

The AC outlet can be tested using a receptacle tester, which ensures the outlet is correctly wired,  or a multimeter, which gives a numerical reading.

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