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Why do we use LED in the tester instead ...

Why do we use LED in the tester instead of a bulb ?

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VGS PUBLICATION-BRILLIANT-ELECTRICAL CONDUCTIVITY OF LIQUIDS-EXERCISE
  1. What is electrolysis ? Give Faraday's first law of electrolysis.

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  2. Why are you advised not to touch electric appliances with wet hands?

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  3. Why do we use LED in the tester instead of a bulb ?

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  4. Why do we use LEDs as indicators in electrical appliances ?

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  5. What is meant by good conductors of electricity?

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  6. What is meant by bad conductors of electricity?

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  7. Why does not distilled water conduct electricity ?

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  8. Why is water used at our homes a good conductor of electricity?

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  9. What is electrolytic cell?

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  10. When we pass current through a copper sulphate solution having copper ...

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  11. If the key is to be coated with aluminium instead of copper, what chan...

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  12. A child staying in a coastal region tests the drinking water and also ...

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  13. Is it safe for electrician to carry out electrical repairs outdoor dur...

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  14. A tester is used to check conduction of electricity through two liquid...

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  15. When the free ends of a tester are dipped into a solution, the magneti...

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  16. What is the main threat to environment from electroplating factories?

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  17. Why should we have to deposit nickel or chromium on iron?

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  18. What is the name given to wires attached to LED ? How are these wires ...

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  19. What are the requirements for fine coating in electroplating process ?

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  20. Name three liquids which when tested in the manner shown in figure may...

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