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Direct current• Constant flow rate from aconstant voltage source• The flow is always samedirections.• One wire is positive andthe other is negative.Alternating current• Voltage differencebetween two pointsreverses in a regularmanner• Electrical current changesdirection back and forth ata fixed frequency (rate)• Each change is called acycle, and the speed of acycle occurs is frequencyof the current.
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