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DC motors are electrical motors powered by direct current, or DC. DC is a type of electrical current that flows in one direction only from sources such as batteries or solar panels. DC may also be produced through the use of a rectifier, which is an electrical device which converts alternating current, or AC, to DC. In spite of their structural differences, the five main types of DC motors discussed in this course perform the same basic function. They convert electrical energy into mechanical energy to spin, lift, wind, or move objects.