When considering how electricity works, it can be useful to imagine water flowing from a tank through a pipe.

Voltage - measured in Volts (V)

This is the overall water pressure.

Capacity - measured in Amp hours (Ah)

This is the amount of water. The more water is in the tank the longer pressure and flow can be delivered.

Current - measured in Amps (A)

This is the amount of water flowing through the pipe over a given period of time. The higher the pressure, the more water flows through the pipe.

Output - measured in Watts (W)

Resistance - measured in ohms (Ω)

This is the width of the pipe. The narrower the pipe, the higher the resistance.
But the narrower the pipe, the more pressure is required to achieve the same power

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