Ohm's
Law defines the relationships between (P) power, (E)
voltage, (I) current, and (R) resistance. One ohm is
the resistance value through which one volt will
maintain a current of one ampere.
( I ) Current
is what flows on a wire or conductor like water
flowing down a river. Current flows from points of
high voltage to points of low voltage on the surface
of a conductor.
Current
is measured in (A) amperes or amps.
( E ) Voltage
is the difference in electrical potential between two
points in a circuit. It's the push or pressure behind
current flow through a circuit, and is measured in (V)
volts.
( R ) Resistance
determines how much current will flow through a
component. Resistors
are used to control voltage and current levels. A very
high resistance allows a small amount of current to
flow. A very low resistance allows a large amount of
current to flow.
Resistance
is measured in 
ohms.
( P ) Power
is the amount of current times the voltage level at a
given point measured in wattage or watts.
