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An electric heater of resistance 8Omega ...

An electric heater of resistance `8Omega` draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Text Solution

Verified by Experts

`P=E/t=(I^(2)Rt)/t=I^(2)R=15xx15xx8=1800W`
So, heat is developed at a rate of 1800 J/sec.
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ZEN PUBLICATION-ELECTRICITY-QUESTIONS SECTION (TEXTUAL EXERCISE)
  1. An electric heater of resistance 8Omega draws 15 A from the service ma...

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  2. Explain the following. a] Why is tungsten used almost exclusively fo...

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  3. A piece of wire resistance R is cut into five equal parts. These parts...

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  4. Which of the following terms does not represent electrical power in a ...

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  5. An electric bulb is rated 220 V and 100 W. When it is operated on I 10...

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  6. Two conducting wires of the same material and of equal. lengths and eq...

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  7. How is a voltmeter connected in the circuit to measure the potential d...

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  8. A copper wire has diameter 0.5mm and resistivity of 1.6xx10^(-8)Omegam...

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  9. The values of current I flowing in a given resistor for the correspond...

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  10. When a 12 V battery is connected across an unknown resistor there is a...

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  11. A battery of 9V is connected in series with resistors of 0.2Omega,3Ome...

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  12. How many 176Omega resistors (in parallel) are required to carry 5A on ...

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  13. Show how you would connect three resistors, each of resistance 6Omega ...

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  14. Several electric bulbs designed to he used on a 220 V electric supply ...

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  15. A hot plate of an electric oven connected to a 220 V line has two resi...

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  16. Compare the power used in the 2Omega resistor in each of the following...

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  17. Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are ...

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  18. Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in...

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

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  20. Explain the following. a] Why is tungsten used almost exclusively fo...

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