The three necessary components of an electrical circuit are

an electrical load, conductors, and a circuit for the electricity flow to follow.

Explanation

The components of a basic circuit are a source of the voltage, the electrical load, a conductor (such as copper wire), and a completed circuit. A switch is unnecessary to current flow, though it certainly helps to be able to open and close the circuit. Current will pass through air but it usually prefers more stable circuitry such as a copper wire; it does not, however, flow upon radio waves. 

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