Question 268: Current Electricity

Question

A galvanometer of resistance 100 $$\Omega $$ has 50 divisions on its scale and has sensitivitv of 20 $$\mu $$A/division. It is
to be converted to a voltmeter with three ranges of 0-2V, 0-10 V and 0-20 V. The appropriate circuit to do so
is

Accepted Answer

20 ÃÂ 50 ÃÂ 10
Ã¢ÂÂ6
= 10
Ã¢ÂÂ3
Amp
$${V_1} = {2 \over {{{10}^{ - 3}}}} = 100 + {R_1}$$
$$1900 = {R_1}$$
$${V_2} = {{10} \over {{{10}^{ - 3}}}} = \left( {2000 + {R_2}} ight)$$
$${R_2} = 8000$$
$${V_3} = {{20} \over {{{10}^{ - 3}}}} = 10 	imes {10^3} + {R_3} = 10 	imes {10^3}{R_3}$$

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Current Electricity

A galvanometer of resistance 100 $\Omega has 50 divisions on its scale and has sensitivitv of 20 \mu $A/division. It is to be converted to a voltmeter with three ranges of 0-2V, 0-10 V and 0-20 V. The appropriate circuit to do so is

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