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Direct current (d.c.) changes direction regularly.
Alternating current (a.c.) changes direction regularly.
The frequency of mains electricity is typically 50 Hz.
Electric current is defined as the charge passing a point in a circuit per unit time.
The unit of electric current is the coulomb (C).
Current in metals is due to the flow of positive ions.
Conventional current is shown flowing from negative to positive.
The actual electron flow is opposite to the direction of conventional current.
The size of an electric current depends on the number of electrons passing and their drift speed.
Electric current can be measured using a digital multimeter.