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What is the common name of '1 kWh' of el...

What is the common name of '1 kWh' of electrical energy?

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Unit of electricity
NA
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. How many joules are there in one kilowatt-hour?

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  2. Name the quantity whose unit is : (a) kilowatt (b) kilowatt-hour

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  3. What is the common name of '1 kWh' of electrical energy?

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  4. A cell converts one form of energy into another form. Name the two for...

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  5. Name the device which converts electrical energy into mechanical energ...

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  6. Name the devices or machines which convert : (a) Mechanical energy i...

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  7. Name the devices or machines which convert : (i) Electrical energy i...

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  8. Fill in the following blanks with suitable words : (a) Power is the ...

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  9. A trolley is pushed along a road with a force of 400 N through a dista...

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  10. What kind of energy transformations take place at a hydroelectric powe...

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  11. What kind of energy transformations take place at a coal-based thermal...

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  12. A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m...

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  13. The power output of an engine is 3 kW. How much work does the engine d...

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  14. An electric heater uses 600 kJ of electrical energy in 5 minutes. Calc...

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  15. How much electrical energy in joules does a 100 watt lamp consume : ...

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  16. Five electric fans of 120 watts each are used for 4 hours. Calculate t...

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  17. Describe the energy changes which take place in an radio.

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  18. Write the energy transformations which take place in an electric bulb ...

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  19. Name five appliances or machines which use an electric motor.

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  20. A bulb lights up when connected to a battery. State the energy change ...

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