% error and uncertainties

Question 1

what is the resolution of a piece of equipment
and give an example

Answer 1

the equipment’s smallest measurable unit (e.g. ruler = 1mm)

Question 2

what is the uncertainty of a piece of measuring equipment and give an example

Answer 2

+/- 0.5 of the resolution of the equipment
(e.g. ruler = +/- 0.5 mm as resolution = 1mm)

Question 3

how do you calculate % error

Answer 3

uncertainty/reading
x 100