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Ohm's Law

If the voltme...

Question

If the voltmeter reads 0.21V and the ammeter reads 0.1A, the resistance of the ammeter is (in ohm)

A

0.01

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B

0.15

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C

0.2

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D

0.1

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Solution

The correct option is C 0.1
$I = 0.1 A; V = 0.21$
$V = I (2 + R_{A})$
$0.21 = 0.1 (2 + R_{A})$
$2.1 = 2 + R_{A}$
$R_{A} = 0.1 Ω$

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