Accuracy, Precision of instrument and errors in measurements

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• When you measure something there is some uncertainty.
• And these uncertainty is known as errors in measurement.

Accuracy

• Accuracy is the how much close to the real value.
• Accuracy of measurements depends upon many factors like as resolution of measuring instrument.

Precision

• What resolution the quantity is measured.

The errors in measurement is classified in two types:-

1. Systematic error
2. Random  error

Systematic error

• Errors in one direction is known as systematic errors.
• Some of the sources of systematic error are:-

           a. Instrumental error:-  Error in measurement due to instruments.

           b. Imperfection in experimental techniques :- If you don't have technique to measure something                 then you will get some error in measurements.

          c. Personal error:- The error in measurements due to lack of knowledge how to use apparatus in                  proper manner. 

Random error

• Error due to randomness in experimental condition.

Least count errors

• The smallest value that can be measured by the measuring instrument is called its least count.
• Least count error is the error associated with resolution of the instrument.