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Resistance and Power

Q1: How many connections does a rheostat have?

A 1

B 2

C 3

D 4

ANS:B - 2

The most common way to vary the resistance in a circuit is to use a rheostat, a two-terminal variable resistor. For low-power applications (less than about 1 watt) a three-terminal potentiometer is often used, with one terminal unconnected or connected to the wiper.



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