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Explain the importance of using in a hou...

Explain the importance of using in a household electric circuit (i) fuse, and (ii) earthing wire.

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LAKHMIR SINGH & MANJIT KAUR-MAGNETIC EFFECT OF ELECTRIC CURRENT -Exercise
  1. Distinguish between the terms 'overloading' and 'short-circuiting' as ...

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  2. (a) When does a fuse cut off current ? How does it do it ? (b) What ...

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  3. Explain the importance of using in a household electric circuit (i) fu...

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  4. (a) An electric iron is rated at 230 V, 750 W. Calculate (i) the maxim...

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  5. What is the function of an earth wire? Why is it necessary to earth me...

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  6. (a) What current is taken by a 3 kW electric geyser working on 240 V m...

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  7. A 1.25 kW heater works on a 220 V mains supply. What current rating wo...

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  8. The maximum number of 40 W tube-lights connected in parallel which can...

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  9. In normal use, a current of 3.5 A flows through a hair dryer. Choose a...

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  10. Which one of the following statements is not true ?

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  11. A car headlamp of 48 W works on the car battery of 12 V. The correct f...

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  12. A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle t...

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  13. A T.V. set consumes an electric power of 230 watts and runs on 230 vol...

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  14. An MCB which cuts off the electricity supply in case of short-circuiti...

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  15. An air-conditioner of 3.2 kW power rating is connected to a domestic e...

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  16. Three appliances are connected in parallel to the same source which pr...

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  17. A vaccum cleaner draws a current of 2 A from the mains supply (a) Wh...

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  18. An electric kettle rated as 1200 W at 220 V and a toaster rated at 100...

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  19. What is the main difference in the wiring of an electric bulb and a so...

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  20. A domestic lighting circuit has a fuse of 5 A. If the mains supply is ...

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