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0.05 s. Fuses. L.O.: What do we use fuses and circuit breakers for? How to use the correct fuse. Fuse. Fuse. Fuses & Circuit Breakers. A fault in an appliance can cause the current to be too great and can lead to the wire overheating and possibly causing a fire.

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  2. Fuses L.O.: • What do we use fuses and circuit breakers for? • How to use the correct fuse

  3. Fuse Fuse

  4. Fuses & Circuit Breakers • A fault in an appliance can cause the current to be too great and can lead to the wire overheating and possibly causing a fire. • A fuse is designed to melt if the current through a circuit is too high, thereby breaking the circuit • The fuse should be just higher than the normal working current • A circuit breaker can be reset rather than replaced Fuses & Circuit Breakers

  5. Fuses Fuses

  6. Earth wire • If an appliance has a metal case it needs to be earthed. • A fault could cause the live wire to touch the metal case. If the appliance is earthed a large current flows down the earth wire and melts the fuse. If the appliance was not earthed there would be a risk of electrocution. Earth wire

  7. Earth wire Earth wire

  8. An electrical fault (1) An electrical fault (1)

  9. An electrical fault (2) An electrical fault (2)

  10. Fuses in plugs are made in standard ratings. The most common are 3A, 5A and 13A. The fuse should be rated at a slightly higher current than the device needs • if the device works at 3A, use a 5A fuse • if the device works at 10A, use a 13A fuse

  11. A circuit breaker is an electromagnetic switch that opens and cuts the current off if too much current passes through it.

  12. Fuses II For the following devices choose fuses from 3A, 5A and 13A. 3.0A 13.0A 5.0A 13.0A 5.0A 13.0A

  13. Workbook page 93

  14. Fuses L.O.: • What do we use fuses and circuit breakers for? • How to use the correct fuse

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