Page 138 - Science Class 06

Static electricity : Electricity produced by rubbing two objects. It does not move.

Current electricity : Electricity that moves through conductors
Electric circuit : A combination of various conductors joined together
Conductor : Material which allows electricity to pass through it
Insulator : Material which does not allow electricity to pass through it

Close circuit : A circuit through which electricity passes continuously
Open circuit : A circuit which brakes the flow of electricity

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i Electricity is also a form of energy.
i Electric charges are defined as (+ve) positive or (–ve) negative charges.
i Like charges repel each other while unlike charge attract each other.
i Copper, silver, gold, graphite, etc. are conductor of electricity.

i Wood, rubber, plastic, etc. are good insulators.
i Water is a poor conductor of electricity.

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Exercise
A. Tick ( ) the correct op on.3
1. Which of the following is not a part of a dry cell?
(a) Coke (b) Zinc Chloride
(c) Manganese dioxide (d) Copper
2. Voltaic cell was developed by the scien st named:
(a) Newton (b) Watson

(c) Volta (d) Aryabha a
3. Which of the following is a conductor?
(a) Copper (b) Rubber

(c) Wood (d) Plas c
4. Which of the following gas is filled in electric bulb?
(a) Argon (b) Carbon dioxide
(c) Oxygen (d) Hydrogen

5. Which of the following is an insulator?
(a) Graphite (b) Silver
(c) Copper (d) Rubber

6. Water is a ______________ conductor of electricity.
(a) poor (b) good
(c) bad (d) none of them

138 Science-6