Measurements & Their Errors Flashcards
What is the SI Unit for Time?
Seconds (s)
What is the SI Unit for Electricity?
Amperes (A)
What is the SI Unit for Length?
Metres (m)
What is the SI Unit for Amount of Substance?
Moles (mol)
What is the SI Unit for Luminous Intensity?
Candela (cd)
What is the SI Unit for Temperature?
Kelvin (K) - 1 Degree Celsius = 274.15K
What is the SI Unit for Mass?
Kilograms (kg)
What is the Derived Unit of Force
kgms^-2
What is the prefix for Tera (T)
10^12
What is the prefix for Giga (G)
10^9
What is the prefix for Mega (M)
10^6
What is the prefix for Kilo (K)
10^3
What is the prefix for Centi (c)
10^-2
What is the prefix for Micro (µ)
10^-6
What is the prefix for Nano (n)
10^-9
What is the prefix for Pico (p)
10^-12
What is the prefix for Femto (f)
10^-15
Define Precision
Precise measurements are ones in which there is very little spread about the mean
value.
Define Repeatability
A measurement is repeatable if the original experimenter repeats the investigation using same method and equipment and obtains the same results.
Define Reproducibility
A measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained.
Define Resolution
This is the smallest change in the quantity being measured (input) of a measuring instrument that gives a perceptible change in the reading.
Define Accuracy
A measurement result is considered accurate if it is judged to be close to the true value.
