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How many 176Omega resistors (in parallel...

How many `176Omega` resistors (in parallel) are required to carry 5A on a 220 V line ?

Text Solution

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`1/R=1/176+1/176+.......n" times"=n/176`
`R=176/n`
`I=V/Rto5=(220n)/176, thereforen=(176xx5)/220=4`
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ZEN PUBLICATION-ELECTRICITY-QUESTIONS SECTION (TEXTUAL EXERCISE)
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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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  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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  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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