Otis Singleton
Electric charge is a fundamental property of matter that causes it to experience a force when placed in an electromagnetic field. The SI unit of electric charge is the coulomb (C), named after French physicist Charles-Augustin de Coulomb. The coulomb is defined as the quantity of charge that passes through the cross-section of an electrical conductor carrying one ampere for one second. It is also approximately equal to the charge of 6.24 x 10^18 positrons.
| Characteristics | Values |
|---|---|
| Unit of electrical charge | Coulomb (C) |
| Symbol | C |
| Named after | French physicist Charles-Augustin de Coulomb |
| Definition | The quantity of electricity carried in 1 second by a current of 1 ampere |
| Value of elementary charge | 1.602176634×10^-19 C |
| Other units | Ampere-hour (A⋅h), elementary charge (e), Faraday constant |
| Charge quantity symbol | q or Q |
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What You'll Learn
The coulomb (C) is the unit of electric charge in the International System of Units (SI)
The coulomb (symbolized as C) is the unit of electric charge in the International System of Units (SI). It is defined as the quantity of electric charge that passes through the cross-section of an electrical conductor carrying one ampere for one second. The unit was proposed in 1946 and officially adopted in 1948. The lowercase letter "q" is often used to represent the quantity of electric charge.
The coulomb is named after French physicist Charles-Augustin de Coulomb. As with every SI unit named after a person, its symbol starts with an uppercase letter (in this case, "C"), but when written out in full, it follows standard capitalization rules for common nouns. For example, "coulomb" is capitalized at the beginning of a sentence or in titles but is lowercase otherwise.
The SI defines the coulomb as "the quantity of electricity carried in 1 second by a current of 1 ampere." This definition involves fixing the value of the elementary charge, denoted as "e," to 1.602176634 x 10^-19 C. This value serves as a defining constant in the SI system.
The coulomb is a convenient unit of measurement for electric charge. It was established before the discovery of the quantity of charge per electron. In electrical engineering, it is common to use the ampere-hour (A⋅h), while physics and chemistry often use the elementary charge (e) as a unit. Chemistry also employs the Faraday constant, representing the charge of one mole of elementary charges.
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Electric charge is a physical property of matter
Electric charge is a fundamental and inherent physical property of matter. It is defined by a magnitude, which determines how strongly matter experiences or produces electric, magnetic, or electromagnetic fields. It is carried by subatomic particles, with negative charges carried by electrons and positive charges carried by protons in the nuclei of atoms.
The unit of electric charge in the International System of Units (SI) is the coulomb (symbolized as C). The coulomb is defined as the quantity of charge that passes through the cross-section of an electrical conductor carrying one ampere for one second. This unit was proposed in 1946 and ratified in 1948. The lowercase symbol q is often used to represent a quantity of electric charge.
The value for elementary charge, expressed in SI units, is 1.602176634 x 10^-19 C. After discovering the quantized character of charge in 1891, George Stoney proposed the unit 'electron' for this fundamental unit of electrical charge. The elementary charge is now denoted by the letter e, with the charge of an electron being -e.
Electric charge can be positive or negative, and like charges repel each other while unlike charges attract. An object with no net charge is referred to as electrically neutral. The motion of electrons in conductive metals in a specific direction is known as electric current. Electric charge is also the source of the electromagnetic (or Lorentz) force, one of the four fundamental interactions in physics.
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Charge quantity is also a physical quantity
Electric charge is a fundamental concept in physics, and it is a physical property of matter. It is carried by subatomic particles and can be positive or negative. Like charges repel each other, and unlike charges attract each other. The electric charge of an isolated system remains constant.
The coulomb is a convenient unit of measurement for electric charge, created before the quantity of charge per electron was known. It is equal to the charge of approximately 6.2415090744×10^18 positrons. The elementary charge, e, is a fundamental constant in the SI system, and its value is exactly 1.602176634×10−19 C. The coulomb can be expressed in terms of the elementary charge as:
> 1 C = e / 1.602 x 10^-19 = 10^19 / 1.602 x 10^-19 e
In electrical engineering, it is common to use the ampere-hour (A⋅h) as a unit of electric charge, while in physics and chemistry, the elementary charge (e) is often used. Chemistry also uses the Faraday constant, which is the charge of one mole of elementary charges.
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Electric charge can be positive or negative
The unit of electric charge in the International System of Units (SI) is the coulomb (C), named after French physicist Charles-Augustin de Coulomb. The coulomb is defined as the quantity of charge that passes through the cross section of an electrical conductor carrying one ampere for one second.
The choice of which charges are positive or negative is arbitrary, as long as it is self-consistent. The convention is that the charge of an electron is negative, and that of a proton is positive. Charged particles with the same sign repel one another, and particles with different signs attract.
The study of photon-mediated interactions among charged particles is called quantum electrodynamics. Charge is a measure of how much a thing interacts with the electromagnetic field. If a charge is pushed in the same direction as the field, it is called a positive charge, and if it is pushed in the opposite direction, it is called a negative charge.
The quantity of electric charge can be directly measured with an electrometer or indirectly with a ballistic galvanometer.
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The elementary charge (e) is a unit commonly used in physics and chemistry
The unit of electrical charge is the coulomb (C), which is defined as the quantity of charge that passes through the cross section of an electrical conductor carrying one ampere for one second. The coulomb was named after French physicist Charles-Augustin de Coulomb and is equal to the charge of approximately 6.24 x 10^18 positrons.
The elementary charge is a useful concept in physics and chemistry because it allows for the specification of magnitude and sign. For example, one can say that an object has a positive charge of 3 Coulomb or a charge of +3 Coulomb. The lowercase symbol q is often used to denote a quantity of electric charge, and this quantity can be directly measured with an electrometer or indirectly with a ballistic galvanometer.
In some contexts, it is meaningful to speak of fractions of an elementary charge. For example, in the fractional quantum Hall effect, the charge exhibited is a fraction of the elementary charge. Additionally, in an isolated system, the total charge remains constant, with the amount of positive charge balancing the amount of negative charge over time.
In summary, the elementary charge (e) is a fundamental unit of electrical charge commonly used in physics and chemistry. It provides a basis for understanding the behaviour of charged particles and the fundamental properties of matter.
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Frequently asked questions
The unit of electrical charge is the coulomb, often symbolized by a capital C.
A coulomb is defined as the quantity of charge that passes through the cross section of an electrical conductor carrying one ampere for one second.
The charge of an electron is denoted as -e, where e is the elementary charge, a fundamental constant in the SI system. The value of e is approximately 1.602 x 10^-19 C.
In electrical engineering, it is common to use the ampere-hour (A⋅h) as a unit of charge. In physics and chemistry, the elementary charge (e) is often used as a unit, and the Faraday constant is used in chemistry.
