JAN TEST 0.0 / 5 ? PhysicsElectricityEnergyGCSEAll boards Created by: abbeyc12Created on: 19-12-17 21:13 Direct current flows in one direction, simple circuit 1 of 24 Alternating current from the mains supply, alters directions 2 of 24 household electricity - pd and frequency p.d. = 230v freq = 50Hz 3 of 24 Periods of AC period of AC = time taken for one complete oscillation (time between one peak and the next) 4 of 24 Frequency of AC definition freq of AC = the number of oscillations per second 5 of 24 Frequency of AC equation 1/period (time between peaks) 6 of 24 Live terminal the live terminal p.d. varies between high postiver and low positive 7 of 24 Neutral terminal the neutral terminal has a p.d. close to earth which is zero 8 of 24 Blue wire bLue = neutraL = Left 9 of 24 striped wire sTriped = earTh = Top 10 of 24 brown wire bRown = live = Right 11 of 24 fuse|high current a fuse will melt when a current is too high 12 of 24 Plastic casing plastic is an insulator 13 of 24 brass pins brass is a good conductor 14 of 24 cables material cables are made of copper because they are bendy and good conductors 15 of 24 cables coating cables have plastic coating because they are good insulators 16 of 24 energy in filament bulbs a lot of energy is wasted in filament bulbs as heat 17 of 24 circuit breakers switch off the current when theres a fault, switch stays open until reset 18 of 24 residual current circuit breakers (RCCB) work faster because they cut off current in a live wire when it is different from current in neutral wire 19 of 24 double insulated no earth wire, designed so live wire cannot touch casing 20 of 24 power definition rate at which energy is transferred by an appliance 21 of 24 power|energy equation power (watts) = energy/time 22 of 24 power|current|p.d equation power (watts) = current x p.d. 23 of 24 energy|p.d.|charge equation energy(joules) = p.d. x charge (coulombs - C) 24 of 24
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