Mains electricty

1. How many joules are in 1 kJ?
4. to convert from milliamps to amps you should ............... by 1000.
6. A ________ core cable can be used for appliances with a plastic case
7. The wasted energy transfer in a light bulb
8. Fuses come in distinct sizes e.g. 3 A, 5A and 13 A. These are known as …………………..
9. Standard unit of time
11. Measures the opposition to the flow of current. Unit is the Ohm.
12. Unit of frequency
13. Any appliance with this should be earthed
18. In a domestic plug, the blue wire is the __________ wire
20. Unit used for electric charge
22. Potential difference of the Earth wire
23. This piece of equipment increases or decreases the voltage in the National Grid
27. An appliance that transfers a large amount of energy every second has a high ________ rating.
29. Plastics and rubber are examples of ___________
30. Main voltage in the UK is ______ V (2 words)
31. Unit of power
32. The unit of potential difference

1. A kettle of power 2500 W is plugged into the mains. What size fuse should it be fitted with?
2. The __________ ________is used to transmit electricity across the UK
3. Value of mains frequency in the UK (unit not needed).
4. The type of electric current supplied by cells and batteries
5. Current is the flow of ________ particles like electrons or ions.
10. Device use to show an electrical signal on a screen
14. A 60W light bulb operates at a p.d. of 5 V. What current is flowing through it? (unit not needed)
15. This type of current reverses in direction from positive to negative
16. Stepping up the p.d. in power lines makes the transfer of electrical energy more …………………
17. The useful energy transfer in a light bulb
19. Unit of energy
20. Metal used to make the wire strands in electrical cables
21. Colour of live wire
24. The unit of electric current
25. This component melts and breaks if a large current passes through it
26. On an oscilloscope a direct current would be a ……………………. line
28. This wire connects from the metal case to the ground