Current Electricity is the continuous flow of electrons. In an electric current, energized electrons flow the negative side of a power supply through a complete path or circuit to the positive side of a power supply while directed by a conductor. The model of positive charge flow is known as a conventional current. A load ( any device that uses energy) can be attached to the circuit to be powered.
To find the current in an electric circuit we must first find the total amount of charge that passes a certain point in the conductor and divide it by the time taken. The equation for this is I = Q / t where I represents the current in amperes (A), Q represents the charge in coulombs (C), and t represents the time in seconds. One ampere is the equivalent of one coulomb of charge passing a certain point in a conductor every second. A device which measures current or Ammeter can also be attached to the circuit in order to find the current.
Eg. How much current flows through a washing machine if 2500 c of charge passes through it in 500 s?
I = Q / t
I = 2500 c / 500 s
I = 5 c / s
Thus 5 A of current flows through the washing machine.
There are two types of currents. DC or direct current and Ac or alternating current. In a direct current , the electrons flows in single direction from the power supply through the conductor to a load and back to the power supply again. In an alternating current the electrons will periodically reverse directions.
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