In this lesson, we'll learn about variable resistors—resistors that change their resistance based in response to some physical input (like potentiometers) or ... ... <看更多>

What is a variable resistor and whats its types? A variable resistor is a resistor of which the electric resistance value can be adjusted. ... <看更多>

The variable resistor is used to vary the current P in the circuit. This enables you to obtain several pairs of values of P & Q, so that you can plot a ... ... <看更多>