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Voltage and Current


the potential difference in charge between two points in an electrical field is called voltage.

Voltage is also called Electromotive force. The greater the voltage, the greater the flow of electrical current.Voltage is symbolized by an uppercase italic letter V or E. The standard unit is the volt, symbolized by a non-italic uppercase letter V.

Voltage can be direct or alternating. A direct voltage maintains the same polarity at all times. In an alternating voltage, the polarity reverses direction periodically.

Current :

Charge is an electrical property of the atomic particles of which matter consists. It is measured in coulombs (C).

Electric current is the flow of electric charge in terms of time. The conventional symbol for current is I.
There are 2 types of current. 
Direct Current (DC) : A direct current (dc) is a current that remains constant with time.
Alternating Current (AC) : An alternating current (ac) is a current that varies sinusoidally with time.

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