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.
