2. An explanation of why lighting, heating and other appliances have different circuits in a house and a description of these circuits.
Heat is generated as current passes through electrical wiring. Sometimes the wire can become so hot it can melt the insulation around it making the wire a hazard. As to control the amount of heat generated to a safe level the wires have a maximum current allowed to pass through them to protect it against an overload. Electrical items often require different amounts of power so because voltage is fixed at a constant 240V the current needs to be varied meaning different appliances need wires with a different maximum current. To be able to supply all the appliances in the house with electricity vast amounts of wiring is needed and organising the wiring in circuits is done. For convenience and safety the wires are grouped with similar current requirements what the electricity is to be used for, such as kinetic, light or heat energy. Having different circuits for different current requirements also means that the wiring can be set specifically designed for carrying a certain current and safety measures such as circuit breakers and fuses can be set to the current. Having multiple circuits is also beneficial in the event that one has a fault then the other electrical appliances remain intact and supplied with power. The circuits are also wired in parallel to stop a single liability bringing down the whole house’s electricity. This is why lighting, heating and other appliances have different circuits in a house.