Practical Skills Flashcards

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1
Q

Name the six S.I base units?

Ignore the candela- for brightness/intensity

A
K - kelvin
mol - mole
kg - mass
m - metre
s - second
A - ampere
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2
Q

What is meant by the term accurate?

A

How close a result is to the true value.

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3
Q

What is meant by the term precise?

A

How closely the repeated results are to one another.

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4
Q

What are errors?

A

The difference between an individual result and the true value.

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5
Q

What is an uncertainty?

A

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

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6
Q

What is the absolute uncertainty?

A

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)

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7
Q

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

A

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

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

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8
Q

How can the percentage uncertainty for multiple measurements be calculated?

A

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

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