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Line 28:
Line 28: − For the definition of a '''newton''', see below under "derived units."+
International System of Units (view source)
Revision as of 14:20, April 23, 2007
, 14:20, April 23, 2007→Ampere: Clarify the place of the newton in SI as regards the definition of "ampere."
The '''ampere''' (symbol A) is the unit of [[electric current]]. (Strangely, electric ''charge'' is not the base quantity.) The definition is as follows:<blockquote>One ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed 1 meter apart in a vacuum, would produce between these conductors a force equal to 2 × 10<sup>−7</sup> newtons per meter of length.</blockquote>
The '''ampere''' (symbol A) is the unit of [[electric current]]. (Strangely, electric ''charge'' is not the base quantity.) The definition is as follows:<blockquote>One ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed 1 meter apart in a vacuum, would produce between these conductors a force equal to 2 × 10<sup>−7</sup> newtons per meter of length.</blockquote>
The '''newton''' is a named derived unit (see below) that takes its derivation from the base units defined above.
=== Kelvin ===
=== Kelvin ===