Yahoo Web Search

Sign In

Search results

  1. en.wikipedia.org › wiki › CandelaCandela - Wikipedia

    The candela ( / kænˈdɛlə / or / kænˈdiːlə /; symbol: cd) is the unit of luminous intensity in the International System of Units (SI). [5] [6] It measures luminous power per unit solid angle emitted by a light source in a particular direction.

    • Candlepower

      Candlepower (abbreviated as cp or CP) is a unit of...

  2. Videos

    View all

  3. www.nist.gov › si-redefinition › candelaCandela | NIST - National Institute of Standards and Technology

    May 16, 2019 · The candela is the SI’s base unit for photometry—the science of measuring light as perceived by the human visual system. It is as notable for what it does not do as for what it does: It does not represent the entire amount of light shining from an object; we have a different unit called the lumen for that.

  4. www.britannica.com › science › candelaCandela (cd) | Britannica

    Candela (cd), unit of luminous intensity in the International System of Units (SI), defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and has a radiant intensity in that same direction of 1683 watt per steradian (unit

    • The Editors of Encyclopaedia Britannica

  5. www.reagent.co.uk › blog › what-is-the-candela-unitWhat Is the Candela Unit of Measurement? | The Science Blog

    May 4, 2022 · The candela is the base unit in the International System of Units (SI) that measures how bright or radiant a light source is, given certain wavelengths that are visible to the human eye. It’s measured in terms of the luminous intensity of a point light source per unit solid angle, known as steradian. Its abbreviated form is ‘cd’.

  6. www.si-units-explained.info › luminositySI Units Explained - The candela (cd)

    If we have a 1 candela (i.e. 1 candlepower) flashlight which just happens to have a beam that illuminates 1 square metre from 1 metre distance,then that square metre will have an illumination of 12.57 lumens, as compared with 1 lumen for the candle. This is why it's not straightforward to compare the output of a flashlight with a candle.

  7. www.measurement.govt.nz › metrology › si-unitsCandela | Measurement Standards Laboratory

    The Unit – candela, cd (kānara) The SI unit for luminous intensity (the brightness of a source of visible light) is the candela (cd), which gets its name from the fact that, for much of history, ‘standard candles' were used to measure the intensity of light. The candela is the only SI base unit intended to quantify the human perception of ...

  8. People also ask

  9. energyeducation.ca › encyclopedia › CandelaCandela - Energy Education

    The candela (cd) is the SI unit of luminous intensity, which is a measure of power emitted from a light source. The definition for a candela is: The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10 12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.