Question

which two things are required to make electric current flow and why

Answer 1

Let's get down to old school level,

You need a battery and connecting wires to make current flow.

Let's get to somewhere where it becomes more comprehensible,

You need a potential difference across the ends of the terminals of the battery to make current flow.

By convention we take the flow of protons as the flow of current and hey! it's an important convention.

P.s, Just a poor joke: you need electrons first to make the current flow.

Thanks,

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