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Ampere (A)
The ampere (symbol: A) is the SI unit of electric current (symbol: I) and is one of the seven SI base units. It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics. In practice, its name is often shortened to amp.

Base unit
Measurement unit that is adopted by convention for a base quantity. For example: The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived.

Candela (cd)
The candela (symbol: cd) is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function (a standardized model of the sensitivity of the human eye to different wavelengths, also known as the luminous efficiency function).

Celsius (°C)
Unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius, who developed a similar temperature scale.

SI derived unit of electric charge. It is defined as the charge transported by a steady current of one ampere in one second.

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