Mains Electricity GCSE Physics AQA (higher) P2.6 in the AQA GCSE revision guide 4.5 / 5 based on 7 ratings ? PhysicsElectricityGCSEAQA Created by: Some like it hotCreated on: 29-01-12 16:02 What is direct current? current from a cell or battery 1 of 23 What is alternating current? current from the mains 2 of 23 What is the frequency of the UK mains power supply? 50Hz 3 of 23 What is the voltage of the mains? 230V 4 of 23 What does the live wire alternate between? -230V and + 230V 5 of 23 What is the potential of the neutral terminal? 0V 6 of 23 How are electrical appliances connected to the mains supply? Cables and a 3-pin plug 7 of 23 Why is the outer cover made of plastic or rubber? Because these are good insulators 8 of 23 What are the pins of the plug made of? Brass 9 of 23 What colour is the Earth Wire? Green & Yellow 10 of 23 What colour is the live wire? Brown 11 of 23 What colour is the neutral wire? Blue 12 of 23 Why does a hair-dryer with a plastic case not need to be earthed? The case is made of plastic 13 of 23 What cables does an appliance with a plastic case have? Live & Neutral 14 of 23 Why do appliances with metal cases need to be earthed? To prevent shocks if the live wire touches the metal case, causing the casing to become live. 15 of 23 What happens if a fault develops in an earthed appliance? The current flows to earth and melts the fuse 16 of 23 What is a circuit breaker? an electromagnetic switch that cuts off the supply if the current is too big 17 of 23 What is an electrical device? Something that transforms electrical energy into other forms 18 of 23 What is power? The rate at which an electrical device transforms electrical energy to other forms 19 of 23 power = current x potential difference 20 of 23 What happens when charge flows through an appliance? Electrical energy is transformed into other forms 21 of 23 What is the unit of charge? Coulombs 22 of 23 What does the UK mains supply mean if it has x frequency? That it alternates every x seconds 23 of 23
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