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AQA Physics (AS) > Practical Skills > Flashcards

Flashcards in Practical Skills Deck (8)
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1

Name the six S.I base units?

Ignore the candela- for brightness/intensity

K - kelvin
mol - mole
kg - mass
m - metre
s - second
A - ampere

2

What is meant by the term accurate?

How close a result is to the true value.

3

What is meant by the term precise?

How closely the repeated results are to one another.

4

What are errors?

The difference between an individual result and the true value.

5

What is an uncertainty?

An estimate of the range of values within which the true values lies for a measurement.

6

What is the absolute uncertainty?

The uncertainty in the quantity (e.g. distance) being measured.

(This is often the resolution of the instrument etc for a vernier calliper +/- 0.01mm)

7

How can the percentage uncertainty of a single measurement be calculated?

Percentage uncertainty = (Absolute uncertainty / measured value) x 10

Note: using a measurement with a higher resolution (smaller absolute uncertainty) will decrease the percentage uncertainty.

8

How can the percentage uncertainty for multiple measurements be calculated?

Percentage uncertainty (multiple readings) = (half the range / mean value) x 100