Convert Coulomb to Franklin (C to Franklin)

Coulomb (C) and Franklin (Franklin) are both units of electric charge. With the conversion form below, you can effortlessly and accurately convert coulomb to franklin. This free online calculator tool makes it simple and easy to perform the conversion from C unit to the Franklin unit.

Electric charge is a fundamental property of matter that causes it to experience electromagnetic force. Charge is measured in coulombs (C) in the SI system. It comes in two types—positive and negative—and is conserved: the total charge in an isolated system never changes. The elementary charge (the charge of a proton) is exactly 1.602176634 × 10⁻¹⁹ C. Charge is the source of electric fields and, when moving, of magnetic fields.

A coulomb (symbol: C) is the SI derived unit of electric charge. It measures the quantity of electric charge transferred by an electric current of one ampere flowing for one second. Coulombs are widely used in physics, electrical engineering, electronics, electrochemistry, and telecommunications to quantify electric charge and analyze the behavior of electrical systems.

One coulomb is equivalent to approximately 6.241509074 × 10¹⁸ elementary charges, such as electrons or protons. The coulomb is closely related to other SI electrical units, including the ampere, volt, farad, and joule, making it fundamental to calculations involving electric current, energy storage, and capacitance.

Coulombs are commonly used to describe the charge stored in batteries and capacitors, the amount of charge flowing through electrical circuits, and the movement of ions in electrochemical processes. As the internationally recognized SI unit of electric charge, the coulomb provides a consistent standard for scientific research, electrical measurements, and engineering applications.

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A franklin (symbol: Fr), also known as a statcoulomb (statC) or the electrostatic unit (esu) of electric charge, is a unit of electric charge used in the centimetre–gram–second (CGS) electrostatic system of units. Franklins were historically used in electrostatics and electromagnetic theory before the International System of Units (SI) became the worldwide standard. Today, the unit is primarily encountered in older scientific literature, textbooks, and historical references.

One franklin is approximately equal to 3.33564 × 10<sup>−10</sup> coulomb (C). Unlike the SI coulomb, the franklin is defined within the CGS electrostatic system, where electric charge is derived from the electrostatic force between charged particles rather than from electric current.

Although the franklin is rarely used in modern engineering or scientific practice, it remains important for understanding historical publications, classical electromagnetism, and conversions between CGS and SI electrical units. Familiarity with the franklin helps researchers accurately interpret older electrical measurements and theoretical work.

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