https://www.churchill.com/home-insurance/tips/electrical-overloading#.Vo3p9Vklkmw
http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/electricityworld/mainselectricityrev3.shtml
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/electricity/householdelecrev5.shtml
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