U 5 - Error, accuracy + uncertainty Flashcards
Def : Absolute error
a range of possible values for your
measurement
How do you work out relative error
Relative error = absolute error ÷ exact value
( X 100 to convert to %)
How can source of a systematic error be determined
Using balance that has not been zeroed
Poorly maintained instruments that become faulty
Faulty readings by observer
Incorrect instrument used
Multiplier of scale factor errors
What are random or indeterminate errors
cause or source of these errors are often difficult to find.
How are random errors formed
A reading is taken incorrectly – error of parallax
Inability to make reading due to fluctuations in reading value
Estimating quantity that lies between graduation lines
How can you eliminate random errors
By repeating the experiment
What are anomalous results
Unexpected
Out of the ordinary
Does not fit the trend or pattern
Uncertainties come from doing what
Measuring instrument
The item/object being measured
The person doing the measurement
Uncertainties can be reduced by
Calibrating instruments correctly
Accurate calculations
Data recorded accurately
Possible ways of preventing errors
Avoid error of parallax
Record values correctly
Round off numbers correctly
