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

1. ## 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

2. ## 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

3. ## Re: Electrical science: Measuring instrument question..need help Urgent?

@saloni are you an electrical engineer???/

4. ## Re: Electrical science: Measuring instrument question..need help Urgent?

Originally Posted by crazybishnoi29
@saloni are you an electrical engineer???/
@crazybishnoi29 - arre this was simple...it was a common subject for all of us at my college!

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