Class 11 Physics Units and Measurements Accuracy and Precision of Instruments

Accuracy and Precision of Instruments

  • Any uncertainty resulting from measurement by a measuring instrument is called error. They can be systematic or random.
  • Accuracy of a measurement is how close the measured value is to the true value.
  • Precision is the resolutionor closeness of a series of measurements of a same quantity under similar conditions.
  • If the true value of a certain length is 3.678 cm and two instruments with different resolutions, up to 1 (less precise) and 2 (more precise) decimal places respectively, are used. If first measures the length as 3.5 and the second as 3.38 then the first has more accuracy but less precision while the second has less accuracy and more precision.

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