BRAINCAKEDerived Units
A derived unit is made by combining SI base units, using the equation that defines the quantity. Many derived units have their own names, but each can always be written in base units.
• newton: F = ma, so 1 N = 1 kg m s−2
• joule: work = force × distance, so 1 J = 1 N m = 1 kg m2 s−2
• watt: power = energy / time, so 1 W = 1 J s−1 = 1 kg m2 s−3
• pascal: pressure = force / area, so 1 Pa = 1 N m−2 = 1 kg m−1 s−2
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More in Measurements and Errors
- SI Base Units
- Prefixes
- Converting Units
- Random and Systematic Errors
- Precision, Repeatability and Reproducibility
- Resolution and Accuracy
- Absolute, Fractional and Percentage Uncertainty
- Combining Uncertainties
All 12 lessons in Measurements and Errors · All AQA AS-level Physics topics