what is external resistance of a circuit?
More specifically, what is meant by the equivalent external resistance of a circuit?
- Mark JLv 49 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.