Mains Electricity 4.0 / 5 based on 1 rating ? PhysicsElectricityGCSEAQA Created by: SunsetCreated on: 18-01-14 17:09 Name the three pins in a three-pin plug? Earth, Neutral and Live 1 of 14 What happens to the fuse if a large amount of electricity flows through the live wire? It will melt 2 of 14 Why should electricians wear rubber soled boots? They will not be earthed because rubber has a high resistance so much less current can flow through them 3 of 14 How is electrical power calculated? Current x Voltage 4 of 14 Give two uses of an LDR (Light Dependent Resistor)? Security Lights and Digital Cameras. 5 of 14 What does it mean if a resistor is ohmic? It follows ohms law: the ration of V/I is constant 6 of 14 What is current measured in? Amps 7 of 14 What is the frequency of A.C. In the Uk mains electricity supply? 50 Hz 8 of 14 What is potential differnce? Wok done per coulomb of charge 9 of 14 How is charge (Q) calculated? Current x Time 10 of 14 5 bulbs are in series with a cell of 10V and 7A What is the voltage and current of each bulb. 2V and 7A 11 of 14 How quickly can a RCCB cut off the electricity supply? 40ms 12 of 14 How does a magnetic circuit breaker work? The electromagnet increases in strength when the current increases. This pulls the iron pivot down, breaking the circuit. 13 of 14 Give one advantage of a RCCB or MCB over a fuse. They can be reset 14 of 14
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