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| style="height:20px; width:600px; text-align:center;" |An [[oscilloscope]] trace of [[Mains Electricity|mains electricity]] shows its [[frequency]] is 50Hz as the time [[period]] is 0.02s per oscillation and the peak [[Potential Difference|potential difference]] is 320V, but the [[Mean Average|average]] over time is 230V.
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===References===
====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 ''Alternating current (a.c.), page 305, 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 ''Alternating current (a.c.), page 50, GCSE Physics, Hodder, 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 ''Alternating current (a.c.), pages 46, 66, GCSE Physics; Student Book, Collins, 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 ''Alternating current, pages 64-65, 224-229, GCSE Physics; Third Edition, Oxford University Press, 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=ad276ad49df77ab4b40ab4fd0fe09672 ''Alternating currents (a.c), page 188, GCSE Combined Science; The Revision Guide, CGP, 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=f0dfb66dafcb0c6e9449e7b1a4ae1ac13 ''Alternating currents (ac), pages 31, 96, 97, GCSE Physics; The Revision Guide, CGP, 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 ''Alternating currents (ac), pages 86, 203, 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 ''Alternating currents (ac), pages 89, 245, 306, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA']