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Oct 6, 2020 · Percentage error definition: Percent error is the difference between the measured value and the true value, as a percentage of true value. We use Percentage Error to compare a measured or experimental value to a true or accepted value value.
BASIC RULES FOR UNCERTAINTY CALCULATIONS. Phys 191 – Uncertainty Worksheet. Convert the following to relative uncertainties: 2.70 ± 0.05 cm. 12.02 ± 0.08 cm. Convert the following to absolute uncertainties: 3.5 cm ± 10 % b. 16 s ± 8 % Complete the following, determining the appropriate uncertainty: (2.70 ± 0.05 cm) + (12.02 ± 0.08 cm) .
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3. The Handbook of Chemistry and Physics lists the density of a certain liquid to be 0.7988 g/mL. Taylor experimentally finds this liquid to have a density of 0.7925 g/mL. The teacher allows up to +/- 0.500% error to make an “A” on the lab. Did Fred make an “A”? Prove your answer. 0.7925 - 0.7988 = 0.0063 = 0.0079 X 100 = 0.79%
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Revision notes on 1.2.1 Errors & Uncertainties for the CIE A Level Physics syllabus, written by the Physics experts at Save My Exams.
You calculate the density of a block of aluminum to be 2.68 g/cm³. You look up the density of a block of aluminum at room temperature and find it to be 2.70 g/cm³. Calculate the percent error of your measurement. Joshua uses his thermometer and finds the boiling point of ethyl alcohol to be 75.0°C.
An example of random error is electronic noise in the circuit of an electrical instrument To reduce random errors: Take at least 3 repeats and calculate a mean , this method also allows anomalies to be identified. Use computers/data loggers/cameras to reduce human error and enable smaller intervals.
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For a digital device which directly outputs a reading (like a digital scale), you can take the uncertainty to be given by the last digit the device outputs. For instance, if it reads 4:18, then the uncertainty would be 0:01 (in whatever units the scale reads).
