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# what is external resistance of a circuit?

More specifically, what is meant by the equivalent external resistance of a circuit?

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- Mark JLv 410 years agoFavorite Answer
When voltage is applied to a circuit, current will flow. More voltage results in more current. This ratio is called the resistance and is described by Ohm's Law:

V = I * R

R = V / I

V=voltage, I=current, and R=resistance

A circuit can consist of multiple devices in a variety of configurations: series, parallel, and combinations.

When looking from the "outside" of the circuit, it is often desirable to get back to basics. If a voltage is applied, how much current will flow? This is the equivalent external resistance.

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