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==Key Stage 3=====Meaning===The '''mains electricity''' is the [[electricity]] supply to houses, shops and [[Factory|factories]]. ==Key Stage 4=====Meaning===The '''mains electricity''' is the [[electricity]] supply to houses, shops and [[Factory|factories]] provided by the [[National Grid]]. ===About Mains Electricity===: The '''mains''' in the houses in the [[UK]] provides a [[Potential Difference|potential difference]] of 230V and provides a maximum [[Electrical Current|current]] of 13A.: The '''mains electricity''' is an [[Alternating Current|alternating current]] with a [[frequency]] of 50Hz.: The [[Power Supply|power supply]] for the '''mains electricity''' is a variety of [[Energy Resource|energy resources]] including; [[Coal#Power|Coal]], [[Natural Gas#Power|Natural Gas]], [[Nuclear Fuel#Power|Nuclear Fuel]] and [[Wind Power#Power|Wind]].{| class="wikitable"|-|[[File:UKEnergySupply2014.png|center|400px]]|-|The [[percentage]] of the [[United Kingdom]]'s [[electricity]] generated by different '''energy resources''' 2014 is shown in a [[Pie Chart|pie chart]]. |}