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===Meaning===
[[File:AnalogueVoltmeter.png|right|300px|thumb|A picture showing an analogue [[voltmeter]].]]
===About Voltmeters===
: [[Voltmeter]]s are added in [[Parallel Circuit|parallel]] to [[Electrical Component|component]]s in a [[Electrical Circuit|circuit]] to find the [[Potential Difference|potential difference]] between two points.
: An ideal [[voltmeter]] has infinite [[Electrical Resistance|resistance]] because otherwise adding an [[voltmeter]] to a [[circuit]] would change the [[Potential Difference]] between two points.
: [[Voltmeter]]s can be [[Analogue Voltmeter|analogue]] with a needle pointing to numbers on a dial or it can be [[Digital Voltmeter|digital]] with a number display.
| style="height:20px; width:200px; text-align:center;" |A '''voltmeter''' placed in [[Parallel Circuit|parallel]] with a [[Electrical Bulb|bulb]].
|}
==Key Stage 4==
===Meaning===
A [[voltmeter]] is a measuring device used to [[measure]] the [[Potential Difference|potential difference]] between two points in a [[Electrical Circuit|circuit]].
===About Voltmeters===
: [[Voltmeter]]s are added in [[Parallel Circuit|parallel]] to [[Electrical Component|component]]s in a [[Electrical Circuit|circuit]] to find the [[Potential Difference|potential difference]] between two points.
: An ideal [[voltmeter]] has infinite [[Electrical Resistance|resistance]] because otherwise adding an [[voltmeter]] to a [[circuit]] would change the [[Potential Difference|potential difference]] between the two points.
: [[Voltmeter]]s can be [[Analogue Voltmeter|analogue]] with a needle pointing to numbers on a dial or it can be [[Digital Voltmeter|digital]] with a number display.
{| class="wikitable"
|+Using a voltmeter on components in series.
|-
|[[File:CircuitDiagramBatteryBulbBulbSeries.png|center|200px]]
|[[File:CircuitDiagramBatteryBulbBulbSeries.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |To [[measure]] the [[Potential Difference|potential difference]] across bulb 1 the [[voltmeter]] must be placed in [[Parallel Circuit|parallel]] with bulb 1.
| style="height:20px; width:200px; text-align:center;" |To [[measure]] the [[Potential Difference|potential difference]] across bulb 2 the [[voltmeter]] must be placed in [[Parallel Circuit|parallel]] with bulb 2.
|-
|[[File:CircuitDiagramBatteryBulbVoltmeterBulbSeries.png|center|200px]]
|[[File:CircuitDiagramBatteryBulbBulbVoltmeterSeries.png|center|200px]]
|}
{| class="wikitable"
|+Using a voltmeter on components in parallel.
|-
|[[File:CircuitDiagramBatteryBulbBulbParallel2.png|center|200px]]
|[[File:CircuitDiagramBatteryBulbBulbParallel2.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |To [[measure]] the [[Potential Difference|potential difference]] across bulb 1 the [[voltmeter]] must be placed in [[Parallel Circuit|parallel]] with bulb 1.
| style="height:20px; width:200px; text-align:center;" |To [[measure]] the [[Potential Difference|potential difference]] across bulb 2 the [[voltmeter]] must be placed in [[Parallel Circuit|parallel]] with bulb 2.
|-
|[[File:CircuitDiagramBatteryBulbVoltmeterBulbParallel.png|center|200px]]
|[[File:CircuitDiagramBatteryBulbBulbVoltmeterParallel.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "2"|In this case both [[voltmeter]]s will give the same [[measure]]ment because the [[Electrical Component|components]] themselves are in [[Parallel Circuit|parallel]].
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Voltmeter, pages 52-3, 56, GCSE Physics; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10415 ''Voltmeters, page 239, GCSE Combined Science; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Voltmeters, page 41, GCSE Physics, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Voltmeters, page 52, GCSE Physics; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac489 ''Voltmeters, pages 25, 106, GCSE Physics; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Voltmeters, pages 293, 296, GCSE Combined Science Trilogy 1, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Voltmeters, pages 60, 61, 235, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Voltmeters, pages 62, 63, 331, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Voltmeters; calibration of, page 316-17, GCSE Combined Science Trilogy 1, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Voltmeters; calibration of, pages 64-5, GCSE Physics, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Voltmeters; circuit symbol, page 38, GCSE Physics, Hodder, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Voltmeters, page 143, GCSE Physics, Pearson Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Voltmeters, pages 186, 210, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Voltmeters, pages 220, 338, 339, GCSE Physics, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Voltmeters, pages 73, 106, GCSE Physics; The Revision Guide, CGP, Edexcel '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Voltmeters, pages 101-103, 259, Gateway GCSE Physics, Oxford, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Voltmeters, pages 178, 224, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Voltmeters, pages 45, 49, 105, Gateway GCSE Physics; The Revision Guide, CGP, OCR '']