Key Stage 4
Meaning
A variable resistor is a resistor which can have its resistance changed.
About Variable Resistors
- A variable resistor can be used to control the current passing through a circuit. If the potential difference is constant then the current decreases as the resistance of the variable resistor increases.
- A variable resistor can be used to control the potential difference of another component in series with it. If the resistance of the variable resistor is increased the potential difference across other components will decrease.