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Thread: Electrical science: Measuring instrument question..need help Urgent?

  1. #1
    Fuchcha FaaDoO Engineer
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    Electrical science: Measuring instrument question..need help Urgent?

    A moving coil ammeter has a fixed shunt of 0.02 ohm with a coil resistance of R=100 ohm and potential difference of 500 mV across it,full scale deflection is obtained.

    1) To what shunted current does this correspond?
    2) Calculate the value of R to give full scale deflection when shunted current is
    i) 10A ii) 75 A iii) with what value of R is 40% of deflection is obtained with I=100A.


    PLZ PLZ PLZZ HELP



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    Hardcore FaaDoO Engineer saloni's Avatar
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    Re: Electrical science: Measuring instrument question..need help Urgent?

    These are my calculations for the above problem--

    1)500mV/20mohm=25 amps
    2)i)50mohm = 500mV/10 amps ii)500mV/75 amps = 6.66mohm (iii)40% is 100 A. So 100% is 250 amps. Rshunt = 2 milliohm

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    Passionate FaaDoO Engineer crazybishnoi29's Avatar
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    Re: Electrical science: Measuring instrument question..need help Urgent?

    [MENTION=9301]saloni[/MENTION] are you an electrical engineer???/

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    Hardcore FaaDoO Engineer saloni's Avatar
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    Re: Electrical science: Measuring instrument question..need help Urgent?

    Quote Originally Posted by crazybishnoi29 View Post
    @saloni are you an electrical engineer???/
    [MENTION=545]crazybishnoi29[/MENTION]- arre this was simple...it was a common subject for all of us at my college!

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