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There must be at least one source of electromagnetic force, or voltage, which is connected through at least one component which uses this voltage, with an unbroken path for conducting the electricity from one terminal of the voltage source through the load and back to the return terminal of the source.

The amount of voltage available from the source must be sufficient to overcome the resistance of the load, aka the voltage sink, and the flow of current will follow a simple formula:

E = I*R, where E stands for the applied voltage, R stands for the internal resistance of the load plus the resistance of the wires between (usually very low) and I is the current which results.

If the circuit is broken, this resistance rises to nearly infinity and so current drops to zero. This is how the switches in your home control the lights.

This is a different matter for A/C since coils and other inductive loads will affect the current.

When Professor Ohm published this law in 1826, his colleagues couldn't believe that the relation was so simple, and hounded him until he retired from the university. Turns out to be a general systems behavior law.

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