Question

A voltmeter has resistance 2000 ohms and it can measure upto 2V . if we want to increase its range to 10V then required resistance in series will be ;

Answer 1

i = V/R = 2/1000 = 2mA
now v = 2000+10 = 2010
R = V/i = 2010/2mA = 1005 kilo-ohm

Answer 2

Concept

When the electric current of one ampere passes through a part where a potential difference (voltage) of one voltage is present, then the resistance of that part is one ohm.

Given

The resistance given is 2000ohms

The voltage given is 2V

Find

We need to find the required resistance

Solution

We Know that I = V/R

I = 2/2000 = 2mA

Now Total V = 2000+10 = 2010

Therefore,

R=V/I = 2010/2

=1005 kilo ohm

Hence the Resistance in the series is 1005Kohm

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