8.12 Living with Electricity

3. A thin wire that melts when too much current is flowing through the live wire. It acts as a safety device
6. A circuit __________ works like the fuse but is reusable when it trips due to large current
7. The ________ is located on the live wire and can be used to turn the circuit on and off
11. The ______ wire oscillate between positive 240 V and - 240 V and is considered the most dangerous as touching it would cause electrocution. Thus, switch and fuse are placed on this wire for safety reasons.
12. ________ extension leads that are coiled up will accumulate heat and can melt the insulation and cause fire
13. For extra safety, some circuits are equipped with ________ current device that compares the current flowing in the live and neutral wires and switches the current off if there is a difference
14. The mains __________ is about 50 to 60 Hz
16. The fuse ________ of a fuse is slightly higher than the normal current drawn by an appliance so that it will allow the appliance to work and yet blow the fuse when the current get higher than usual

1. _______ are a safe and simple way of connecting appliances to the mains
2. Most low-powered appliances do not have the earth wire but uses _______ insulation to protect the wires from being exposed
4. The ________ wire completes the circuit and is at 0 V
5. Old, frayed wiring can be an electrical hazard as ________ strands will have higher resistance that induces heating effect to melt insulation and cause a fire.
8. Touching a socket or plug with _____ hands can be dangerous as tap water are good conductors of electricity
9. The voltage of our mains socket is about two _________ and twenty V to two ________ and forty V
10. The current flowing from the mains is ________ in nature
15. The ______ wire is a safety wire for providing an alternative path of least resistance for any current flowing through the metal casing of an appliance. It channels the current to the ________ and causes the fuse to blow so that the user is protected