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A transformer is an electrical device used to convert AC power at a certain voltage level to AC power at a different voltage, but at the same frequency. Transformers increase or decrease the voltage of alternating current. Alternating current is electric current that regularly reverses its direction. Transformers provide a simple, cost effective means to change this voltage. Transformers enable electric power companies to transmit alternating current easily and efficiently, while ensuring the proper voltage for industrial machinery, lights, home appliances, and other electrical equipment. Some transformers have special uses, such as those designed to handle high-frequency alternating currents, or to vary the amount of output voltage delivered to a circuit.
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