Why rheostat is used in potentiometer instead of rheostat in series in field winding?
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- A rheostat is a variable resistor which is used to control current.
- In contrast to potentiometers, rheostats have to carry a significant current.
- Therefore they are mostly constructed as wire wound resistors.
- Resistive wire is wound around an insulating ceramic core and the wiper slides over the windings
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