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Electrical Charge Unit Conversions

abcoulomb amp·hour coulomb statcoulomb
1 abC = 1 2.778 * 10-3 10 2.998 * 1010
1 A·h = 360 1 3600 1.079 * 1013
1 C = 0.1 2.778 * 10-4 1 2.998 * 109
1 statC = 3.336 * 10-11 9.266 * 10-14 3.336 * 10-10 1
Note: The prefix "ab" is used to indicate an electromagnetic unit in the centimeter-gram-second system.
The prefix "stat" is used to indicate an electrical unit in the electrostatic centimeter-gram-second system of units.
Standard unit = Coulomb (C)

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Electric charge is a fundamental property of matter that describes the intrinsic electrical property of particles such as electrons and protons. It is one of the key concepts in physics and plays a fundamental role in understanding the behavior of matter and the interactions between particles. Here are some key points about electric charge:

Like charges attract, unlike charges repel - RF CafeTypes of Electric Charge:

  • There are two types of electric charge: positive and negative.
  • Protons are positively charged, while electrons are negatively charged.
  • Positive charges repel each other, and negative charges repel each other, but positive and negative charges attract each other.

Conservation of Electric Charge:

The principle of conservation of electric charge states that the total electric charge in a closed system remains constant. In other words, electric charge cannot be created or destroyed, only transferred from one object to another.

Quantization of Electric Charge:

  • Electric charge is quantized, meaning it comes in discrete, indivisible units.
  • The elementary charge (e) is the charge of a single proton or electron and is approximately equal to 1.602 x 10^-19 coulombs (C).

Charge Interactions:

  • Coulomb's Law describes the force of attraction or repulsion between two charged objects. It states that the force is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.
  • The direction of the force depends on the types of charges involved (attractive or repulsive).

Charge in Everyday Life:

  • Electric charge is responsible for many everyday phenomena, including the operation of electronic devices, the flow of current in electrical circuits, and the behavior of magnets.
  • It is also responsible for static electricity, where objects can become charged due to friction and can either attract or repel each other.

Units of Electric Charge:

  • The SI unit of electric charge is the coulomb (C). One coulomb is equal to the charge of approximately 6.242 x 10^18 protons or electrons.
  • Smaller units, such as the milliampere-hour (mAh) or microcoulomb (µC), are often used in practical applications.



Posted September 11, 2023
(updated from original post on 4/23/2001)

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    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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