ANSWER 4.

Volt … is a measurement of the electrical potential of a power source.
Amp…is the measurement of strength of the electrical current flow.
Watt…is the measurement of the electrical power required to operate a component.
Ohm…is the measurement of the resistance of a conductor (To calculate the minimum size of a fuse and wiring for a particular component you simply divide the wattage by the voltage and that gives you the amperage. Eg if you are fitting 2 x 150 watt driving lights on a 12v system you will design the circuit with 30-amp fuse and 30 amp wire to power the relay and lights.) 300 w divided by 12v = 25 amps. required to operate these lights.

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