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Summary AQA Physics A Level - 3.1 Measurements and their Errors Revision Notes

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3.1 Measurements and their Errors (7408)
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This document briefly summarises the key points in the 'Measurements and Errors' topic of the AQA Physics A Level course.

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Measurements And Their Errors

SI Units And Prefixes
● SI Units (International System of Units) are fundamental base units
● Idea is they cannot be simplified (‘broken down’) into any smaller units


Prefixes
● Tera (T) - 10​12
● Giga (G) - 10​9
● Mega (M) - 10​6
● Kila (k) - 10​3
● Centi (c) - 10​2
● Milli (m) - 10​-3
● Micro (µ) - 10​-6
● Nano (n) - 10​-9
● Pico (p) - 10​-12
● Femto (f) - 10​-15


Limitation of Physical Measurements
Random Errors
● Occur when measurements are being made
● Result in measurements varying in unpredictable ways
● Can’t control the factors causing variation so ​can’t correct error
● Fixed by taking many measurements and finding ​mean
● Example:
○ Resistor rated at 12Ω measures as 12.5, 12 or even 14 with a
multimeter
○ Variation could be due to change in temp., due to current or difficulty
using multimeter
○ Rated resistance is the average resistance


Systematic Errors
● Occur when measurements being made
● Result in measurements varying in consistent ways

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Subject
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