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Several electric bulbs designed to be us...

Several electric bulbs designed to be used on a `220 V` electric supply line, are rated `10 W`. How many lamps can be connected in parallel with each other across the two wires of `220 V` line if the maximum allowable current is `5 A` ?

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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. The table below shows the current in three different electrical applia...

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  2. A boy noted the readings on his home's electricity meter on Sunday at ...

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  3. Several electric bulbs designed to be used on a 220 V electric supply ...

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  4. Two exactly similar electric lamps are arranged (i) in parallel, and (...

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  5. How does the heat H produced by a current passing through a fixed resi...

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  6. The current passing through an electric kettle has been doubled. The h...

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  7. Name two effect produced by electric current.

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  8. Which effect of current is utilised in an electric light bulb?

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  9. Which effect of electric current is used in the working of an electric...

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  10. Name two effect produced by electric current.

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  11. Explain why, filament type electric bulbs are not power efficient.

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  12. Why does the cord of an electric heater not glow while the heating ele...

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  13. (a) Write down the formula for the heat produced when a current I is p...

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  14. Why is an electric light bulb not filled with air? Explain why argon o...

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  15. Explain why, tungsten is used for making the filaments of electric bul...

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  16. Explain why, the current that makes the heater element very hot, only ...

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  17. When a current of 4.0A passes through a certain resistor for 10 minute...

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  18. A heating coil has a resistance of 200 Omega. At what rate will heat b...

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  19. An electric heater of resistance 8 Omega draws 15 A from the service m...

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  20. A resistance of 25 Omega is connected to a 12V battery. Calculate the ...

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