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# Help with science coursework - percentage error of equipment

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1. I need to calculate the percentage uncertainty of some equipment from my science coursework.
I know the calculation is - percentage uncertainty/actual measurement x 100

So the percentage uncertainty is something like 0.1 and the actual measurement is what you have actually recorded during the practical. So for example, if you are calculating the percentage error for a measuring cylinder, would the 'actual measurement' be of the volume of water used, or the actual purpose of the experiment which was to heat some water for three minutes using a lamp?

Can you calculate the percentage uncertainty of the following:
Digital Stopwatch (00m00ms) -
Metre Ruler (100cm) -
Digital thermometer (00.00 c) -
Measuring cylinder (10cm3) -
Calculator - does this count??

And what is the 'actual measurement' I divide by? Is it the same for each one?

Thank you. I have finished my coursework but am trying to improve my marks so my teacher recommended researching this but i dont understand

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