Basic Electrical Theory Ohms Law, Current, Circuits & More. There are two types of current, direct current (DC) and alternating current (AC). DC is current that flows in one direction with a constant voltage polarity while AC is current that changes direction periodically along with its voltage polarity. Thomas Edison and Alessandro.
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Power. Power is defined as the rate energy () is transformed or transferred over time. We measure power in units of joules/second, also known as watts. () An electric circuit is capable of transferring power. Current is the rate of flow of.
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