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Using electricity
- 1. Case 1 Case 2 1. What can happen to the person in each case? 2. How can we prevent this from happening? Activity 1 1
- 2. Case 1 Case 2 Activity 1 2 Electrical Hazard
- 4. Wiring in 3pin Plug Live pin Neutral Earth Wire Cable grip 4 Neutral pin Live Wire Earth pin
- 5. 5 Wiring in 3pin Plug Plastic insulation Metal conductor Plastic outer casing
- 6. Safety devices: Fuses • Fuse contains a thin piece of wire made from a metal that has a low melting point. • If the current is too large in the circuit, the fuse wire becomes very hot and melts. Symbol of a fuse 6
- 7. 7 Safety devices: Fuses 5A 3A 4A 3A 5A 4A Electrical appliance Electrical appliance Electrical appliance Electrical appliance Case 1 Case 2 Correct fuse for a circuit is the one that allows the correct current but blows if the current is a little large
- 8. 8 Safety devices: Circuit breaker • A circuit breaker cuts off the current if too much current flows. • They are used to protect the ring of sockets in a house. (Often called ring main.)
- 9. 9 Reducing risks from electrical hazard • Never poke things into socket. • Never touch bare metals of plugs. • Keep electricity away from water and don’t use switches with wet hands. • Do not plug too many things into one socket. • Never use something with a damaged wire.
- 11. 11 1. Live wire (brown) Earth wire (green and yellow) Neutral wire (Blue) fuse Cable grip
- 12. 12 2. Fuse Earth wire 3. The insulation have different colors so that users can know the type of wires such as live wire and neutral wire.
- 13. 13 4. When the current is 6A, the fuse will melt. 5. Never poke things into socket. Never touch bare metals of plugs. Keep electricity away from water and don’t use switches with wet hands. Do not plug too many things into one socket. Never use something with a damaged wire.
Editor's Notes
- (Students will be paired. Then they will be given 4 min to discuss about each cases and someone will be picked randomly to present the answer.) Everyday we use our mobile phone, TV, Laptop and tablets. All these devices use energy called electricity. Therefore, our lives will be really hard if there is no electricity. Before we start the lesson, I would like u work in pair and discuss on the 2 scenarios shown here. I will give u 3 min to discuss. So lets start now.
- (Students will be paired. Then they will be given 4 min to discuss about each cases and someone will be picked randomly to present the answer.) Everyday we use our mobile phone, TV, Laptop and tablets. All these devices use energy called electricity. Therefore, our lives will be really hard if there is no electricity. Before we start the lesson, I would like u work in pair and discuss on the 2 scenarios shown here. I will give u 3 min to discuss. So lets start now.
- Here in Myanmar, the large majority of electricity comes from hydropower. The electricity is the distributed through national grid across the country to our homes . We got the electricity in our home through the main supply which is the socket. There are 2 important things to know about it. It has alternating current of 230Volts and frequency of 50Hz. Whenever we plug electrical appliances to the socket, we are actually connecting them to the main supply.
- In this video , we are going to look at different wires that we find in plugs and cables and why touching the brown one can give u electric shock. When we open up the plug we used at home, it usually consists of 3 core cable. The live wire, neutral wire and earth wire. Each of the wire is made of copper so that they can conduct electricity. And it is wrapped around by insulating plastic. The colour of insulating plastic is specific to the specific types of wire. That helps us to identify them. The live wire is brown and it is the one that provides the alternating current from the main supply. Meanwhile, the neutral wire blue completes the circuit by carrying away the current . This means electricity flows into the device through the live wire and flows out through the neutral wire. Lastly we have earth wire which is stripe green and yellow. The earth wire doesn’t normally carry a current at all. Safety features
- This is the pic of a fridge and here is someone opening the fridge door. As u can see, the electricity travels along the live wire and it goes out through neutral wire.