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Propagation of Error

A 0 - 40A amm...

Question

A (0 - 40)A ammeter has a guaranteed accuracy error of 2% of the full scale reading. If the current measured by this instrument is 10 A, the value of relative limiting error in percentage will be

A

2%

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B

4%

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C

0.5%

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D

8%

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Solution

The correct option is D 8%
Ammeter is accurate upto value

$= \frac{2}{100} \times 40 = 0.8 A$

Relative limiting error

$= \frac{0.8}{10} \times 100 = 8 %$

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