Difference between revisions of "Variable Resistor"
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===Meaning=== | ===Meaning=== | ||
[[File:VariableResistorSymbol.png|right|300px|thumb|The symbol for a '''variable resistor'''.]] | [[File:VariableResistorSymbol.png|right|300px|thumb|The symbol for a '''variable resistor'''.]] | ||
| + | A '''variable resistor''' is a [[resistor]] which can have its [[Electrical Resistance|resistance]] changed. | ||
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| + | ===About Variable Resistors=== | ||
| + | : A '''variable resistor''' can be used to control the [[Electrical Current|current]] passing through a [[circuit]]. If the [[Potential Difference|potential difference]] is constant then the [[Electrical Current|current]] decreases as the [[Electrical Resistance|resistance]] of the '''variable resistor''' increases. | ||
| + | : A '''variable resistor''' can be used to control the [[Potential Difference|potential difference]] of another [[Electrical Component|component]] in [[Series Circuit|series]] with it. If the [[Electrical Resistance|resistance]] of the '''variable resistor''' is increased the [[Potential Difference|potential difference]] across other [[Electrical Component|components]] will decrease. | ||
Revision as of 15:44, 27 February 2019
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.