Power (physics)
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Power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. Power is a scalar quantity.
Ansel Adams photograph of electrical wires of the Boulder Dam Power Units, 1941–1942
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