P4 flashcards 0.0 / 5 ? PhysicsElectricityRadioactivityMedical PhysicsGCSEOCR Created by: 12jconwayCreated on: 29-06-16 12:24 What is a static charge ? A static charge is a charge that does not move it is created by rubbing two electrical insulators together. 1 of 12 Name 2 uses of static ? Dust precipitators, paint spraying and crop dusting. 2 of 12 What is resistance ? How easily current can flow. 3 of 12 What colour is the live wire ? Brown 4 of 12 What is the use of an earth wire ? The earth wire is a safety wire to prevent the casing of the appliance becoming live. 5 of 12 What are the threee fuses used in the uk ? 3,5 and 13 amps. 6 of 12 What is an RCD ? RCD stands for residual current device. An RCD is a safety device also known as a circuit breaker. 7 of 12 What is a fuse ? A fuse prevents the device from getting damaged in a power surge. Designed to melt to break the circuit. 8 of 12 What is double insulation ? It means that you do not need an earth wire as it has a plastic coating. 9 of 12 What is ultrasound ? Ultrasound is a longitudinal wave above 20,000 Hz whichi is about the threshold of human hearing. 10 of 12 What is half-life ? Half-life is the time it takes to half the number of whatever you have. 11 of 12 What is transmutation ? When an unstable atom gives out an alpha or beta particle it will change the atom. 12 of 12
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