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Answer: AC stands for Alternating Current. The movement (or flow) of electric charge periodically reverses direction. An electric charge would for instance move forward, then backward, then forward, then backward, over and over again. The usual waveform of an AC power circuit is a sine wave, however in certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. This is the type of electricity that is found in our homes. AC voltage in the home is commonly 110 volts for most ordinary consumer electronic items. Dryers and bigger appliances are usually 220 volts. Some industrial equipment requires 440 volts and above. European countries use 220 volts for most household items.
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