A resistor is a tool used to limit how much current flows through a circuit. Resistors have varying resistance.
When resistors are wired in series.md) they add their individual values to create a total resistance value for the series circuit.
Where
Resistors wired in series.md) will always have more resistance individually than if they were wired by themselves.
When resistors are wired in parallel they have a combined resistance calculated by the following formula:
Where
Resistors wired in parallel will always have less resistance individually than if they were wired by themselves.