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State whether an electric heater will co...

State whether an electric heater will consume more electrical energy or less electrical energy per second when the length of its heating element is reduced. Give reason for your answer.

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The correct Answer is:
More electrical energy; Power is inversely proportional to resistance
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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. At a given time, a house is supplied with 100A at 220V. How many 75W, ...

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  2. If the potential difference between the ends of a fixed resistor is ha...

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  3. State whether an electric heater will consume more electrical energy o...

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  4. The table below shows the current in three different electrical applia...

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

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

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

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

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

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  10. Name two effect produced by electric current.

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

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

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  13. Name two effect produced by electric current.

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

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

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

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

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

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

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

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