SI Units

Coulomb

Definição

A unidade de carga elétrica do SI, definida como a carga transportada por uma corrente de um ampere em um segundo (1 C = 1 A·s), equivalente à carga de aproximadamente 6,242 × 10¹⁸ cargas elementares.

Explicação

Named after Charles-Augustin de Coulomb. A standard AA battery holds roughly 9,000–10,000 coulombs of charge. The elementary charge of one electron is 1.602×10⁻¹⁹ coulombs — meaning one coulomb represents about 6.24 billion billion electrons. Phone battery capacity is measured in milliamp-hours (mAh); a 3,000 mAh battery stores 3 A × 3,600 s = 10,800 C.

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RELATED TERMS

Metro

A unidade de comprimento de base do SI, definida como a distância que a luz percorre em 1/299.792.458 de segundo.

Quilograma

A unidade de massa de base do SI, definida por meio da constante de Planck.

Segundo

A unidade de tempo de base do SI, definida com base nas oscilações do átomo de césio-133.

Kelvin

A unidade de temperatura termodinâmica de base do SI, cujo ponto de origem é o zero absoluto.

Ampere

A unidade de corrente elétrica de base do SI.