Question
Download Solution PDFIn order to increase the range of measuring voltage, ______ is connected in ______ with voltmeter.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
To increase the ranges of a voltmeter, we need to connect a high multiplier resistance in series with voltmeters.
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
Important Points
To increase the ranges of ammeter, we need to connect a small shunt resistance in parallel with ammeters.
We 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
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