In order to understand, the significance of rheostat and its working principle, let us refresh our basic of electric circuits.
The three main parameters of an electric circuit are: voltage applied to the circuit, current through the circuit and the resistance offered by the circuit.
Now, we know these parameters are interdependent. That is, to change the current, we can either change the voltage applied or change the resistance of the circuit.
When we use a rheostat in a circuit, what we are basically doing is changing the resistance of the circuit, to change the current. As the current and resistance are inversely proportional, if a decrease in current is required, we will increase the resistance of the rheostat. Similarly, if an increase in current is required we would simply decrease the resistance of the rheostat.
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Негізгі бет Rheostat என்றால் என்ன? | variable resistor, Resistivity, resistance | Students Corner
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