physics grade 10

2. Let’s study how electric circuit works in our home
Electric power is generated by electric power stations
These electric power stations pass curent through our homes
by electric poles or underground cables
Electric circuit reach our homes through main supply

3. 

5. :
• 15 Ampere current rating appliances - They are used for
appliances using high loads of electricity
Eg.Electric iron , Geyser
• 5 Ampere current rating apppliances - They are used
for appliances carrying low loads of electricity
Eg . Tubelight , T.V

6. Live wire
Neutral wire
Earth wire

7. It is the third type of wire but it does not carry electricity .
One end of earth wire is buried into the ground and the
other end is connected to the metal casing of electrical
appliances .
If the live wire comes in contact with the metal case then
current directly passes into the earth by the earth wire .
It provides a low resistance conducting path for current .
Hence earth wire is used to prevent people from electric
shocks

8.  If too many appliances are used simultaneously
[OR]
If too many appliances are connected to a single socket
they draw extremely large amount of current
Due to this the wire may get overheated and may cause
fire and start to burn
This is overloading

9. SHORT CIRCUITING
When live and neutral wire come in contact with each another they
cause short circuiting .
This happens if the insulation of both gets torn
Due to high current to may start to catch fire and burn
This can be prevented by a FUSE

11.  A fuse is a device that is used in a circuit
It prevents the damage to the circuit and overloading
It stops the flow of unduly high electric current
Nowadays MCBs are used instsed of fuse

13. MCB - Miniature Circuit Board
• If current becomes large
,MCB puts off a switch
breaking of power supply
• These can be switched on
again and reused

14. Difference between MCB and Fuse

15. QUESTIONS :
1. Explain about short circuiting.
2. Any three diffences between fuse and MCB
3. What are the three types of wires used in a socket ?
4. What happens in the earth wire ?