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 negative to positive 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.
Voltage 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 cumulative amount of current times the voltage level at any given point in space or time.
Power is measured in watts/hour or wattage.