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
Ohm
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The ohm is the unit of electrical resistance in the International System of Units. It is named after German physicist Georg Ohm. Various empirically derived standard units for electrical resistance we
A laboratory one-ohm standard resistor, c. 1917
One of the functions of many types of multimeters is the measurement of resistance in ohms.