Line 4 (Zhengzhou Metro)
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Line 4 of Zhengzhou Metro is a rapid transit line in Zhengzhou. It opened on December 26, 2020.
Train 0427 approaching Central Business District station
Volt
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The volt, named after Alessandro Volta, is the unit of measurement of electric potential, electric potential difference, and electromotive force in the International System of Units.
Josephson voltage standard chip developed by the National Bureau of Standards as a standard volt
A multimeter can be used to measure the voltage between two positions.
1.5 V C-cell batteries
Alessandro Volta