which of these is absolutely necessary in an electric circuit
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It is not that it is just necessary. Electron flow, in the first place, OCCURS due to the potential difference between the 2 terminals - negative and positive terminals.
Emf or potential difference is the driving force of the electrons in the electric circuit which causes the electrons to flow from the negative terminal to the positive terminal.
If the circuit is not closed, electrons will not flow.
Emf or potential difference is the driving force of the electrons in the electric circuit which causes the electrons to flow from the negative terminal to the positive terminal.
If the circuit is not closed, electrons will not flow.
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