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watt balance |
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watt balance [′wät ‚bal·əns] (physics) A device for making a highly accurate comparison of electrical and mechanical powers, in which the force on a current-carrying coil in a constant magnetic field is balanced by the gravitational force on an accurately measured mass, and then, with the current source removed, the coil is moved at constant speed in the same magnetic field and the induced potential difference is measured. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The National Institute of Standards and Technology (NIST) watt balance experiment completed a determination of Planck constant in 1998 with a relative standard uncertainty of 87 X [10. The first, called the moving coil watt balance method, relates electrical energy to mechanical power at the quantum level. The NIST watt balance experiment is being completely rebuilt after its 1998 determination of the Planck constant. |
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