How to work out Vrms
Peak V/sqrt2
How to work out percentage uncertainty
fractional uncertainty x100
How to work out fractional uncertainty
Uncertainty/actual value
What is a parallax error?
Error from viewing a measurement scale from a angle rather than directly perpendicular
Difference between random and systematic errors
.Random errors cause reasons to be spread around the true value, effecting precision
. Systematic errors causes each reading to be shifted from the true value by the same amount, affects accuracy
How to reduce uncertainties
. Repeat readings and find the mean
.use computers and data loggers
.calibrate apparatus
What to do with uncertainties when adding or subtracting data
Add the absolute uncertainties
What to do with uncertainties when multiplying or dividing data
Add the percentage error
What to do with uncertainties when raising data to a power
Multiply the percentage uncertainty by the power
What control on oscilloscope is used to centre traced vertically?
Y-shift
What control of oscilloscope is used to centre trace horizontally?
X-shift
