Question
Download Solution PDFThe voltage range of a current meter can be extended by adding:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFWe can extend the range of ammeter by keeping a shunt resistance.
Here Rm = internal resistance of the coil
Rsh = Shunt resistance
I = Required full-scale range
Im = Full scale deflection of current
As the two resistances, Rm and Rsh are in parallel, the voltage drop across the resistance is equal.
Where
‘m’ is called multiplying power
To increase the range of a voltmeter, we need to the series resistance and it is given by
Where V is the required voltmeter range
Vm is the voltmeter range
Rm is the meter internal resistance
Note:
- To increase the ranges of ammeter, we need to connect a small shunt resistance in parallel with ammeters.
- To increase the ranges of a voltmeter, we need to connect a high series of multiplier resistance in series with voltmeters.
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