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Depending on the device to be powered, a.c. current may be used directly, or converted to d.c. Electric lighting, motors, and heating appliances, typicaly use a.c. power directly. Electronic appliances that have bipolar, semiconductor devices, convert a.c. current to d.c. due to the fact that these devices must be connected (biased) in a particular polarity. These devices would be destroyed if connected to a.c.

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