علوم انجليزى صف سادس الدرس الثالث من الوحده الاخيرة

Science For Sixth Primary - Term Two - Lesson Three

The importance of the fuse
1- Protecting electric equipments from damge.
2- Protecting homes from fires.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

How does a fuse work?
1- When the uncovered parts of the connecting wire touch each other and the electric current passes in the fuse wire increase.
2- The wire of fuse heats and melts leading to a breaking in the circuit and preventing the electric current from passing.

Safety rules when using electricity at home:
Firstly: For personal safety:
1- Do not touch any electric switches or equipment with wet hands.
2- Do not touch any uncovered parts of electric wires.
3- Do not put you hands inside a radio or a television while it is switched on and plugged in.
4- Do not put any metallic body in the electric current source.

Seondly: Equipment and home safety:
1- Unplug all electric equipments when they are not in use.
2- Be sure that the switch of any equipment is "off" before plugging or unplugging to avoid electric sparks.
3- Avoid operating several electrical equipments at the same time to avoid the risk of overload.
4- Use new electric connections instead of damaged ones.
5- When a fuse wire burns, replace it with another fuse for the same current.
6- Before replacing a damaged fuse, check why the first fuse was damaged so that the problem is solved such that it will not be repeated.