international volt การใช้

• The 1893 definitions of the ampere and the ohm by the IEC led to the joule as being defined in accordance with the IEC resolutions being 0.02 % larger than the joule as defined in accordance with the artefacts helds by the BIPM . In 1908, the IEC prefixed the units of measure that they had defined with the word " international ", hence the " international ampere ", " international volt " etc . It took more than thirty years before Giorgi's work was accepted in practice by the IEC . In 1946 the CIPM formally adopted a definition of the ampere based on the original EMU definition and redefined the ohm in terms of other base units.