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If the potential difference between the ...

If the potential difference between the end of a wire of mixed resistance is doubled, by how much does the electric power increase?

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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. Name the physical quantity whose unit is watt.

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

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

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

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

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

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

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

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

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

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

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

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  13. A bulb is rated as 250V, 0.4A. Find its : (i) power and (ii) resistanc...

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  14. For a heater rated at 4kW and 220V, calculate: (a) the current, (b...

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  15. An electric motor takes 5 amperes current from a 220 volt supply line....

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  16. Which uses more energy: a 250 WTV set in 1 hour or a 1200 W toaster in...

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  17. Compare the power used in the 2 Omega resistor in each of the followin...

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  18. Two lamps, one rated 40W at 220V and the other 60W at 220 V, are conne...

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  19. An electric kettle connected to the 230V mains supply draws a current ...

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  20. A 2 kW heater, a 200 WTV and three 100W lamps are all switched on from...

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