Current is measured in Amps and an
amp or ampere is defined as the number of electrons or charge (Q in Coulombs)
passing a certain point in the circuit in one second, (t in Seconds).
Electrical current is generally
expressed in Amps with prefixes used to denote micro amps ( μA = 10-6A ) or
milliamps ( mA = 10-3A ). Note that electrical current can be either positive
in value or negative in value depending upon its direction of flow.
Current that flows in a single
direction is called Direct Current, or D.C. and current that alternates back
and forth through the circuit is known as Alternating Current, or A.C.. Whether
AC or DC current only flows through a circuit when a voltage source is
connected to it with its “flow” being limited to both the resistance of the
circuit and the voltage source pushing it.
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