Shunt resistors are used to measure currents that would potentially damage an ammeter.
This could be a result of the magnitude of the current passing through the circuit or the possibility of current spikes.
They usually have a small, well-defined resistance so as not to affect the current they are measuring.
A shunt resistor typically looks different from a normal resistor, having two large terminals with one or more strips of metal connecting them.
The resistance of a metal is inversely proportional to its cross-sectional area, so the more strips a shunt resistor has, the lower its resistance.
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