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An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is
  • a)
    2%
  • b)
    2.5%
  • c)
    4%
  • d)
    5%
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full sca...
Limiting Error Calculation:
To calculate the limiting error of the ammeter, we first need to determine the full scale reading and then apply the accuracy percentage specified.

Full Scale Reading:
The full scale reading of the ammeter is 25 A.

Accuracy Percentage:
The guaranteed accuracy of the ammeter is 1% of the full scale reading.

Calculation:
1% of 25 A = 0.01 x 25 = 0.25 A

Limiting Error:
Since the current measured is 5 A, the limiting error would be 0.25 A / 5 A x 100% = 5%.
Therefore, the limiting error for the measured current of 5 A using the 0-25 A range ammeter is 5%.
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Community Answer
An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full sca...
Concept:
Limiting error: The maximum allowable error in the measurement is specified in terms of true value, is known as limiting error. It will give a range of errors. It is always with respect to the true value, so it is a variable error.
Guaranteed accuracy error: The allowable error in measurement is specified in terms of full-scale value is known as guaranteed accuracy error. It is a variable error seen by the instrument since it is with respect to full-scale value.
Calculation:
Given that, full-scale reading = 25 A
Guaranteed accuracy error = 1% of full-scale reading = 1% of 25 = 0.25 A
True value = 5 A
Limiting error = 0.25/5 = 0.05
Limitting error = 5%
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