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: The [[Electrical Resistance|resistance]] of a [[resistor]] can be found by attaching an [[ammeter]] in [[Series Circuit|series]] with the [[resistor]] and a [[voltmeter]] in [[Parallel Circuit|parallel]] with the [[resistor]].
: All [[electrical component|component]]s in a [[circuit]] act as [[resistor]]s, including [[wire]]s. The longer a [[wire]] the more [[Electrical Resistance|resistance]] it will have to a [[Electrical Current|current]].
{| class="wikitable"
|-
|[[File:Resistor.png|center|200px]]
|[[File:ResistorSymbol.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |A [[resistor]].
| style="height:20px; width:200px; text-align:center;" |The symbol for a [[resistor]].
|}
==Key Stage 4==
===Meaning===
[[File:ResistorSymbol.png|right|300px|thumb|The symbol for a [[resistor]].]]
A [[resistor]] is a [[Electrical Component|component]] in an [[circuit|electrical circuit]] which makes it difficult to [[electricity]] to pass through it.
===About Resistors===
: A [[resistor]] is a [[Electrical Component|component]] designed to have a particular [[Electrical Resistance|resistance]].
: [[Resistor]]s are added to [[circuit]]s to control the [[Electrical Current|current]] which will pass through for a certain [[Potential Difference|potential difference]].
: The greater the [[Electrical Resistance|resistance]] of a [[resistor]] the smaller the [[Electrical Current|current]] will be.
: The [[Electrical Resistance|resistance]] of a [[resistor]] can be found by attaching an [[ammeter]] in [[Series Circuit|series]] with the [[resistor]] and a [[voltmeter]] in [[Parallel Circuit|parallel]] with the [[resistor]].
: All [[electrical component|component]]s in a [[circuit]] act as [[resistor]]s, including [[wire]]s. The longer a [[wire]] the more [[Electrical Resistance|resistance]] it will have to a [[Electrical Current|current]].
===Resistors in Series===
: Adding [[resistor]]s in [[Series Circuit|series]] increases the [[Electrical Resistance|resistance]] in the [[circuit]].
===Resistors in Parallel===
''NB: You only need to know what happens with identical [[resistors]] in [[Parallel Circuit|parallel]].