MAINS ELECTRICITY. 0.0 / 5 ? SciencePhysicsGCSEAQA Created by: AmyH11Created on: 09-02-16 19:28 Direct Current. Current used in cells and batteries that only flows one way. 1 of 8 Alternating Current. Current used in mains electricity that changes it direction of current flowing. 2 of 8 Frequency. The number of crests of a wave that move past a given point in a given unit of time (Hz) 3 of 8 Live Wire. Alternates between positive and negative and is very dangerous. (The blue wire) 4 of 8 Neutral Wire, Stays at a potential close to zero relative to Earth. (The brown wire) 5 of 8 Eath WIre. Connects the casing of an appliance to stake in the ground. It helps to prevent shock. (The yellow and green wire.) 6 of 8 Oscilloscope. A type of electronic test instrument that allows observation of constantly varying signal voltages. 7 of 8 Breaker (RCCB) A device that quickly disconnects current to prevent serious harm from an ongoing electric shock. 8 of 8
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