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xyz xz Grade: 12th pass
        

How does voltmeter measures potential difference

7 years ago

Answers : (1)

Ramesh V
70 Points
										

Voltmeter


A voltmeter is connected in parallel with the circuit element across which potential difference is to be measured. It should have a very high resistance as not to alter the circuit resistance, and hence circuit current.


The galvanometer can measure voltages upto IGG. For larger potential differences, a suitable high resistance R (called multiplier) is connected in series.


voltmeter

The value of R is chosen according to the maximum voltage V that we want to measure. But the galvanometer by itself can only handle a voltage of IgG. The remaining potential difference (V - IgG) should be across the multiplier R. The current through it is Ig. Therefore, equating voltage drops, we get


V = Ig G + Ig


R



The resistance of the voltmeter (i.e., a galvanometer in series with a high resistance) is


RV = G + R


Since R is high, the multiplier increases the resistance of the voltmeter, and of course, extends the voltage range (from IgG to V).


--


regards


Ramesh

7 years ago
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