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IGCSE Physics revision
Transcript of IGCSE Physics revision
Both energy providers
Emf= Energy (J)/Charge (C) + - Series, measures in Amps V Parallel, measures in volts R=I
_ V Ohms law I V Directly proportional ( 0,0 ) More on resistance R L Factors affecting resistance Length of wire
Thickness of wire
Type Electrical power P=E _ t E=vit Unit J.s -1 Or w ETC. Series circuits Rules- Current is the same everywhere R total= R1+R2 Total p.d is shared between the components Parallel curcuits Rules- Current in each branch adds up to the current in the main branch 1/rt=1/r1+1/r2 p.d is the same everywhere Sensor circuits How does the resistance change and therefore change the output voltage Potentiometer Switching circuits Relay + Transistor Example-
Temp of fan I
Thermistor + Transistor Rectifier circuits Time delay On/off, 1,0, Yes/No Analogue continuous Gates Truth tables Logic circuits in control Control system Input Control Output Examples- High temp indicator Night time alarm Electrical safety High and low V circuits Mains electricity Fuses and circuit breakers Earthing