Advertisements
Advertisements
प्रश्न
When does an electric short circuit occur?
उत्तर
Direct contact between the live and neutral wires can result in an electric short circuit. This happens when,
- the insulation of wires is damaged or
- there is a fault in the electric appliance.
APPEARS IN
संबंधित प्रश्न
Why should the wires carrying electricity not be touched barefooted?
State whether the following statement is true or false.
A wire with a green insulation is usually the live wire of an electric supply.
Describe how an electromagnet could be used to separate copper from iron in a scrap yard.
What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring?
Give the symbol of an electric fuse used in circuit diagrams.
Along with live wire and neutral wire, a third wire is also used in domestic electric wiring. What name is given to this third wire?
What is the electric potential of the wire in a mains supply cable?
Usually three insulated wires of different colours are used in an electrical appliance. Name the three colours.
What is the usually colour of the insulation of :
(a) live wire
(b) neutral wire
(c) earth wire?
Give two reasons why different electrical appliances in a domestics circuit are connected in parallel.
State the voltage at which electricity is supplied to our houses.
A fuse should always be placed in the ____________.
Earth wire carries ____________.
The most important safety method used for protecting home appliances from short-circuiting or overloading is ____________.
Why is it necessary to earth metallic appliances?