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Question

A 2 A full-scale PMMC type dc ammeter has a voltage drop of 100 mV at 2 A. The meter can be converted into a 10 A full-scale dc ammeter by connecting a

A
12.5 mΩ resistor in parallel with the meter
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B
12.5 mΩ resistor in series with the meter
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C
50.0 mΩ resistor in parallel with the meter
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D
50.0 mΩ resistor in series with the meter
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Solution

The correct option is A 12.5 mΩ resistor in parallel with the meter
PMMC resistance,
Rm=100 mV2 A=50 mΩ

Now, Multiplying factor,
m=102=5

Shunt resistance required,

Rsh=Rmm1=5051=12.5 mΩ

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