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State two factors on which the electrica...

State two factors on which the electrical energy consumed by an electrical appliance depends.

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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. If current flows through two lamps arranged: (a) in series, (b) in...

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  2. The figure below shows a variable resistor in a dimmer switch. Ho...

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  3. State two factors on which the electrical energy consumed by an electr...

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  4. Which one has a higher electrical resistance: a 100 watt bulb or a 60 ...

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  5. COMMERCIAL UNIT OF ENERGY

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  6. An electric bulb is rated at 220V, 100W. What is its resistance?

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  7. What is the SI unit of (i) electric energy, and (ii) electric power?

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  8. Distinguish between kilowatt and kilowatt hour.

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  9. Name the physical quantity whose unit is watt.

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  10. What is the meaning of the symbol kWh? Which quantity does it represen...

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  11. If the potential difference between the end of a wire of mixed resista...

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  12. An electric lamp is labelled 12V, 36W. This indicates that it should b...

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  13. What current will be taken by a 920 W appliance if the supply voltage ...

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  14. Define watt. Write down an equation linking watts, volts and amperes.

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  15. Define watt-hour. How many joules are equal to 1 watt-hour?

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  16. How much energy is consumed when a current of 5 amperes flows through ...

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  17. An electric bulb is connected to a 220V power supply line. If the bulb...

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  18. In which of the following cases more electrical energy is consumed per...

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  19. An electric kettle rated at 220V, 2.2kW, works for 3 hours. Find the e...

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  20. In a house two 60W electric bulbs are lighted for 4 hours, and three 1...

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