Q21  A PMMC instrument gives 25 mA at full scale reading when a potential difference across its terminals is 32mV. Show that how it can be used  (a) as an ammeter for the current measurement in the range of 0 –3 A  (b) as a 0 – 510V range voltmeter for the voltage measurement.  (c) find the multiplying factor of shunt and AND  voltage amplification

Delmar's Standard Textbook Of Electricity
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ISBN:9781337900348
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Chapter29: Dc Generators
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Q21

 A PMMC instrument gives 25 mA at full scale reading when a potential difference across its terminals is 32mV. Show that how it can be used 

(a) as an ammeter for the current measurement in the range of 0 –3 A 

(b) as a 0 – 510V range voltmeter for the voltage measurement. 

(c) find the multiplying factor of shunt and AND  voltage amplification

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