the national grid 0.0 / 5 ? PhysicsElectricityGCSEWJEC Created by: Jessmetcalfe00Created on: 11-01-15 19:12 state one advantage of sending electricity along overhead wires instead of underground cables. If there is a problem with one of the wires it can easily be fixed. 1 of 14 state one disadvantage of using overhead wires instead of underground cables. They don't look very nice. 2 of 14 transformers only work with a.c. what does that mean. alternating couvent 3 of 14 Explain why transformers only work with a.c They only work with a.c. as they need a changing magnetic field. 4 of 14 Give ONE reason why electricity is sent along the wires at very high voltages. To reduce energy lost as heat. 5 of 14 what is the national grid? It is te system where there are wires and cables to transmit electricity from power stations to the consumers 6 of 14 what equation involves current, power and voltage. power= voltage X current 7 of 14 the input alternating voltage is known as what coil? primary coil. 8 of 14 the output alternating voltage is known as what coil? secondary coil. 9 of 14 if there are more coils on the secondary coil what transformer is it? step down transformer 10 of 14 if there are more coils on the primary coil what transformer is it? step up transformer 11 of 14 power is measured in what ? watts 12 of 14 current is measured in what? amps 13 of 14 voltage is measured in what? volts 14 of 14
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