Question

35. An ammeter of range 100 mA has a resistance of 2 ohm. What resistance should be connected in series with it to use it as a voltmeter of range 1 volt ?​

Answer 1

Answer:

first to convert mA to A

which is equal,

1000mA=1A

if 1000mA=1A

    100mA=?

by cross multiplication,let the unknown be y

1000mA x y =  1A x 100mA

we eliminate 1000mA(from left hand side) by dividing 1000mA in both sides

y = 1A x 100mA

      1000mA

we get y = 1A x 0.1

therefore y= 0.1A,so 100mA= 0.1A

Remember from ohm's law,

V=IR

where V=1v,I=0.1A

and where R is made as a subject,by eliminating I through dividing it both sides

R=V/I

R=1v/0.1A

R=10 ohms.   answer

Explanation:

since current in series connection is the same amount throughout. then the resistance of 10 ohms should be connected in series as a voltmeter of range  1 volt with the resistance of 2 ohms.

thank you,

Answer 2

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