Definition:Candela
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Definition
The candela is the SI base unit of luminous intensity.
It is defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of a frequency of $540 \times 10^{12} \ \mathrm {Hz}$ and that has a radiant intensity in that direction of $\dfrac 1 {683}$ watts per steradian.
Symbol
- $\mathrm {cd}$
The symbol for the candela is $\mathrm {cd}$.
Its $\LaTeX$ code is \mathrm {cd} .
Sources
- 1969: J.C. Anderson, D.M. Hum, B.G. Neal and J.H. Whitelaw: Data and Formulae for Engineering Students (2nd ed.) ... (previous) ... (next): $1.$ Units and Abbreviations: $1.2$ SI units $(1)$ Basic units
- 1976: Ralph J. Smith: Circuits, Devices and Systems (3rd ed.) ... (previous) ... (next): Chapter $1$: Electrical Quantities: Definitions and Laws: The International System of Units
- 1976: Ralph J. Smith: Circuits, Devices and Systems (3rd ed.) ... (previous) ... (next): Chapter $1$: Electrical Quantities: Definitions and Laws: The International System of Units: Table $1$-$1$ Basic Quantities
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): candela
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): candela