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Sunday, May 13, 2012

ELECTRICITY

Brighter and dimmer

The number of batteries used in a circuit affects the brightness of the bulb. 
The bulb becomes brighter when more batteries are added to the circuit. The more the batteries,the more the brightness of the bulb.



The number of bulbs used ini circuit also affects the brightness of the bulbs. 

The bulbs become dimmer when more bulbs are added to the circuit. The more the bulbs, the less the brightness of the bulbs.


Conductors and Non-conductors


Some objects can conduct electricity. Some objects cannot conduct electricity.
Objects that CAN conduct electricity are called conductors. These objects are made of metal(logam). When a conductor is connected to a circuit, the bulb will light up.


Objects that CANNOT conduct electricity are called Non-conductors. 
Usually they are made of plastic, rubber, wood, glass and cloth. When the Non-conductor is connected to a circuit, the bulb will not light up.

Plastics
wood


















pencil (wood)
Clothes








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rubber products






A switch


A switch is used to connect or break a circuit.

When a switch is turned on, the circuit is complete. The bulb in the circuit will light up.

When a switch is turned off, the circuit is incomplete. The bulb in the circuit will not light up.




There are many different types of switches.
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