Watt balance, SI unit research

Watt balance, SI unit research

C026/5825 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 64.3MB

Downloadable file size: 2.9MB

Price image Pricing

Please login to use the price calculator


Restrictions: Editorial use only

Caption: Watt balance. Physicist adjusting a watt balance, an electromechanical apparatus used to precisely measure the definition of an amp. One amp is presently one coulomb of electrical charge per second, which was defined using findings from ampere balances. The watt balance is expected to produce a more accurate definition than the ampere balances, as it has an extra calibration step to ensure greater precision. This research is part of attempts to redefine the standard international (SI) definition of units such as the kilogram, ampere and related units. Photographed in 2014, at the National Physical Laboratory, Teddington, UK.

Release details: Model release not available. Property release not required.

Keywords: 2014, 21st century, accuracy, adjusting, adult, amp, ampere, amps, apparatus, balance, britain, british, caucasian, coulomb, definition, definition of the kilogram, device, electric current, electrical, electrical engineering, electricity, electromechanical, england, english, equipment, europe, european, human, instrument, lab, laboratory, machine, male, man, metrologist, metrology, middle-aged, more accurate, national physical laboratory, npl, one person, people, person, physical, physicist, physics, precise, redefinition, research, researching, scientific, scientist, si unit, standard mass, technological, technology, teddington, uk, united kingdom, watt balance, white

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.