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:[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']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Alternating current (a.c.), pages 397, 411, GCSE Combined Science, Pearson 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 ''Alternating current (a.c), pages 157, 174, GCSE Physics, Pearson 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 ''Alternating currents, page 246, GCSE Physics, CGP, 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 ''Alternating currents, pages 169, 192, 199, GCSE Combined Science; The Revision Guide, 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 ''Alternating currents, pages 45, 79, 89, GCSE Physics; The Revision Guide, CGP, Edexcel '']
====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 ''Alternating currents, page 214, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
==Key Stage 5==
===Meaning===
[[Alternating Current]] ([[Alternating Current|AC]]) is an [[Electrical Current|electric current]] that periodically reverses direction.
===About Alternating Currents===
*Standard form of [[electricity]] supplied to homes and businesses.
*[[Alternating Current|AC]] voltage oscillates in a sinusoidal pattern.
*Frequency of [[Alternating Current|AC]] is 50 [[Hertz|Hz]] or 60 [[Hertz|Hz]] depending on the region.
*[[Alternating Current|Alternating current]] is used for power distribution because it is more efficient over long distances.
*[[Alternating Current|AC]] can be easily transformed to different voltages using [[Electrical Transformer|transformers]].
*The root mean square (RMS) value of [[Alternating Current|AC]] voltage is used to express its effective value.
*[[Alternating Current|Alternating current]] can cause electromagnetic interference (EMI), which needs to be managed in sensitive electronic equipment.
*[[Alternating Current|Alternating current]] is generated by [[alternator]]s in power plants and is used in [[motor]]s, [[generator]]s, and various household appliances.
===Examples===
*Household electrical outlets provide [[Alternating Current|AC]] power.
*[[Alternating Current|AC]] is used in power transmission over long distances due to reduced energy loss.