State And Clarify Ohms Legislation And Its Limitations
Artifact requirements are still used, but metrology experiments relating accurately-dimensioned inductors and capacitors offered a more elementary foundation for the definition of the ohm. Since 1990 the quantum Hall impact has been used to outline the ohm with high precision and repeatability. The quantum Hall experiments are used to examine the stability of working standards which have convenient values for comparability.
The dependence of resistance on temperature therefore makes resistance depend on the present in a typical experimental setup, making the law on this form difficult to directly confirm. Maxwell and others worked out several methods to check the law…