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Questions and Answers
Which units are part of the SI base units?
Which units are part of the SI base units?
- Metre, kilogram, second, ampere
- Metre, kilogram, second
- Metre, kilogram, second, ampere, kelvin
- Metre, kilogram, second, ampere, kelvin, mole, candela (correct)
What is a base unit of measurement?
What is a base unit of measurement?
- A unit adopted for a base quantity (correct)
- A unit multiple of a given unit
- A unit that can be expressed in terms of others
- A unit involving the combination of quantities with different units
What is a derived unit?
What is a derived unit?
- A unit multiple of a given unit
- A unit that has been explicitly designated
- A unit for a derived quantity involving the combination of quantities with different units (correct)
- A submultiple or a unit fraction of a given unit
What is a unit multiple?
What is a unit multiple?
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What are unit prefixes?
What are unit prefixes?
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Study Notes
SI Base Units
- The International System of Units (SI) consists of seven base units.
- The base units include: meter (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electric current, kelvin (K) for temperature, mole (mol) for the amount of substance, and candela (cd) for luminous intensity.
Base Unit of Measurement
- A base unit serves as a fundamental measurement for a quantity and is not defined in terms of other units.
- Base units are the foundation for all other measurements and forms the basis for derived units.
Derived Unit
- Derived units are formed by combining base units through multiplication or division.
- Examples include newton (N) for force, which is derived from kg·m/s², and joule (J) for energy, which is derived from N·m.
Unit Multiple
- Unit multiples are expressions that represent a quantity as a multiple of a base unit, often using a numerical prefix.
- They facilitate easier expression of large or small quantities without altering the base unit's definition.
Unit Prefixes
- Unit prefixes denote powers of ten and modify the size of the base unit in a systematic manner.
- Common prefixes include kilo- (10³), centi- (10⁻²), milli- (10⁻³), and mega- (10⁶), each indicating a specific factor by which to multiply the base unit.
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