Electrical safety
Download
1 / 16

Electrical Safety - PowerPoint PPT Presentation


  • 232 Views
  • Uploaded on

Electrical Safety. Electrical Safety. Electric current will always take the path of least resistance. This is usually the quickest way to the Earth. Even small voltages can kill. Electrical Safety. Read the leaflet on Electrical Safety.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Electrical Safety' - kermit-mcfadden


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Electrical safety1
Electrical Safety

  • Electric current will always take the path of least resistance.

  • This is usually the quickest way to the Earth.

  • Even small voltages can kill.


Electrical safety2
Electrical Safety

  • Read the leaflet on Electrical Safety.

  • List what you think are the 10 most important “rules” on electrical safety.


Electrical safety3
Electrical Safety

  • There are three wires in a plug.

  • The brown wire carries the live current.

  • The yellow and green wire leads to the Earth.

  • The blue wire completes the circuit.


Electrical safety4
Electrical Safety

  • Everyone should be able to wire a plug!

  • Take a plug and correctly wire it.

  • Do not attempt to place the plug in a socket.

  • Get the teacher to check your wiring


Electrical safety5
Electrical Safety

  • If the live wire touches the metal case of an appliance:

    • The current will flow through the Earth wire to the Earth

    • Because there is so little resistance, there will be a massive surge in current.

    • This will melt the fuse wire.

    • The current supply is thus cut off.


Electrical safety6
Electrical Safety

  • Read the information on p110 of Further Science on double insulation.

  • Copy the symbol for double insulation.

  • Make a note to explain what it means


Fuses

Fuses

Page 110 of Further Science


Fuses1
Fuses

  • This is the symbol for a fuse.


Fuses2
Fuses

  • If too much current flows in a circuit the fuse will melt and break the circuit.

  • The fuse protects:

    • The wiring

    • The appliance

    • The user


Fuses3
Fuses

  • Different appliances require different sized fuses, e.g.

    • A cooker, 30 Amp

    • A lighting circuit, 5A

    • A table lamp, 3A

    • An electric kettle, 13A


Fuses4
Fuses

  • Fitting the wrong sized fuse is one of the most frequent causes of fire in the home.

  • Many people die in these fires each year.


Fuses5
Fuses

  • In modern houses and buildings fuses have tended to be replaced by residual circuit breakers (RCB)


Residual circuit breakers

Residual Circuit Breakers

Page 111

Further Science


Residual circuit breakers1
Residual Circuit Breakers

  • Read p111 of Further Science

  • Make a set of bullet points on what RCB’s are and how they work.

  • This material is examined on Higher tier papers and questions only.


ad