The ampere, a fundamental unit of electric current, has faced challenges in precise measurement. However, Ohm’s law, which relates current, voltage, and resistance, provides a practical alternative. This law is based on empirical observations rather than fundamental physics, but has proven accurate to parts per ten million in various measurements. The redefinition of the ampere based on the elementary charge will eventually allow testing of Ohm’s law at the quantum scale, potentially revealing its validity down to atomic dimensions.
Source: https://www.nist.gov/si-redefinition/ampere-present
Keywords: metrology, quantum, electricity, physics, electronics
