Measurements & their Errors Flashcards
How do we find uncertainty on measuring equipment
Lowest measurement division +-
How do we calculate percentage uncertainty
Uncertainty/measurement x 100
How do we calculate fractional uncertainty
Uncertainty/measurement
What is absolute uncertainty
The +- N
How do we find uncertainty in added/subtracted data
Add absolute uncertainties
How do we find uncertainty in multiplied/divided data
Add percentage uncertainties
How do we find uncertainty in data to a power
Multiply percentage uncertainty by the power
How do we draw a gradient with uncertainties
Draw a gradient going through all the error bars
How do we find uncertainty in a graph
Draw the steepest and shallowest gradients which both go through the error bars. Steepest - shallowest / steepest x 100
How do we reduce uncertainty
Take measurements of large quantities
Reproduce experiment
Precision
Define random error
An error from chance, can be caused b y slight fluctuations in the environment
Define systematic error
An error with a consist error in readings
Define human error
AN error caused by human fault or is something limited by their capabilities
Define zero error
An error when a measuring instrument stays at/can’t return to zero
How do you use a micrometer
Place item inside and screw it down
One revolution = 0.5mm
Fine devision = 0.001mm When the main divine lines up with the fine devision
