Electric current is a flow of electrical charge. Electrical charge will only flow round a complete (closed) circuit if there is a potential difference, so a current can only flow if there’s a source of potential difference. The unit of current is the ampere, A.
In a single closed loop, the current has the same value everywhere in the circuit.
Potential difference (or voltage) is the driving force that pushes the charge around. It’s unit is the volt, V.
Resistance is anything that slows the flow down. Unit: ohm n
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