1 Answer
The zero error of an ammeter refers to the reading it shows when no current is actually flowing through it. Ideally, when there is no current, the ammeter should show a reading of zero. However, in practice, due to imperfections in the instrument, it might show a small deflection (positive or negative) even if no current is flowing.
Types of Zero Error:
How to Correct Zero Error:
In summary, the zero error is an initial misreading that needs to be adjusted for accurate current measurement.
Types of Zero Error:
- Positive Zero Error: If the needle of the ammeter points to a value higher than zero when no current is flowing, it indicates a positive zero error.
- Negative Zero Error: If the needle points to a value lower than zero, it indicates a negative zero error.
How to Correct Zero Error:
- Before taking any measurements, the ammeter should be adjusted so that the needle points to zero when no current is flowing. This ensures accurate readings.
- If the zero error is not corrected, the ammeter's readings will be offset by that error, leading to incorrect current measurements.
In summary, the zero error is an initial misreading that needs to be adjusted for accurate current measurement.