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==Key Stage 4==
{{#ev:youtube|https://www.youtube.com/watch?v=m_3JrA-sDEg}}
{{#ev:youtube|https://www.youtube.com/watch?v=51mSWRfAsAw}}
===Meaning===
Investigate the factors affecting the [[Electrical Resistance|resistance]] in a [[circuit]].
====Improving [[Precision]]====
: Use an Ensure the same wire is used for all repeat readings to reduce the [[ammeterRandom Error|random error]] with a greater .: Ensure the wire is straight along the ruler to reduce the [[resolutionRandom Error]]caused by inconsistencies in the length of the ruler.: Use pointed contacts to connect to the wire to reduce the uncertainty of the length due to thick/wide contacts during repeat readings.: Ensure a low [[Electrical Current|current]] throughout to reduce the [[heating]] effect of the [[Electrical Current|current]] on the [[wire]]. This improves [[voltmeterprecision]] with a greater when done over repeat readings because [[Electrical Resistance|resistance]] is affected by the [[temperature]] of the [[wire]] reducing the range of possible results for the same length or [[resolutionwire]].
===Experiment 1b: Resistance and Length of a Wire===
|}
: Set up the equipment as shown in the [[diagram]].#Close the with an open [[switch]].
#Place the clips for the [[circuit]] at 10cm apart on the [[wire]].
#Close the [[switch]].
====Improving [[Precision]]====
: Use an Ensure the same wire is used for all repeat readings to reduce the [[ammeterRandom Error|random error]] with a greater .: Ensure the wire is straight along the ruler to reduce the [[resolutionRandom Error]]caused by inconsistencies in the length of the ruler.: Use pointed contacts to connect to the wire to reduce the uncertainty of the length due to thick/wide contacts during repeat readings.: Ensure a low [[Electrical Current|current]] throughout to reduce the [[heating]] effect of the [[Electrical Current|current]] on the [[wire]]. This improves [[voltmeterprecision]] with a greater when done over repeat readings because [[Electrical Resistance|resistance]] is affected by the [[temperature]] of the [[wire]] reducing the range of possible results for the same length or [[resolutionwire]].
===Experiment 2: Resistors in Series===
====Improving [[Precision]]====
: Use an [[ammeter]] with a greater [[resolution]]the same resistor for each repeat. Do not just use the same value of resistor as they may be slightly different from one another.: Use a low [[voltmeter]] with a greater [[resolutionElectrical Current|current]]and turn the circuit off between readings. This prevents the wires and resistors increasing in temperature which would increase resistance and affect future readings including repeat readings.
===Experiment 2: Resistors in Parallel===
|[[File:RequiredPracticalParallelResistors3.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "3"|A The [[Circuit Diagram|circuit diagramdiagrams]] of the [[apparatus]] used to investigate the effect of the number of [[resistor]]s in [[Series Parallel Circuit|seriesparallel]] and the [[Electrical Resistance|resistance]] in the [[circuit]].
|}
====Improving [[Precision]]====
: Use an [[ammeter]] with a greater [[resolution]]the same resistor for each repeat. Do not just use the same value of resistor as they may be slightly different from one another.: Use a low [[voltmeter]] with a greater [[resolutionElectrical Current|current]]and turn the circuit off between readings. This prevents the wires and resistors increasing in temperature which would increase resistance and affect future readings including repeat readings.