Charge and current

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Current is the rate of flow of charge

In the metal wires of a circuit, this charge is carried by electrons. Metals are good conductors as they have free electrons which are able to move.

When current flows past a point in a circuit for a length of time, then the charge that has passed is given by this formula:

CHARGE = CURRENT X TIME = Q = I X T.

Q (charge, measured in coulombs (C))
I (current, measured in amperes (A))
T (time, measured in seconds (s))

More charge passes around the circuit when a bigger current…

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