In addition to the fundamental SI units like the meter (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and candela (cd), there are several derived SI units that are used to measure various physical quantities. Some of these units are related to electricity and basic electrical concepts. Here are some definitions of derived SI units commonly used in the context of electricity:
Coulomb (C): The coulomb is the SI unit of electric charge. It is defined as the charge transported by a constant current of one ampere in one second.
Volt (V): The volt is the SI unit of electric potential difference or electromotive force. It is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power.
Ohm (Ω): The ohm is the SI unit of electrical resistance. It is defined as the resistance between two points of a conductor when a constant potential difference of one volt produces a current of one ampere.
Ampere (A): The ampere is a fundamental SI unit of electric current. It is defined as the constant current that, if maintained in two parallel conductors of infinite length and negligible cross-section, would produce a force of 2 x 10^-7 newtons per meter of length between the conductors.
Watt (W): The watt is the SI unit of power. It is defined as the rate at which work is done or energy is transferred when one joule of energy is expended in one second.
Joule (J): The joule is the SI unit of energy. It is defined as the amount of work done when a force of one newton is applied over a distance of one meter.
Farad (F): The farad is the SI unit of capacitance. It is defined as the capacitance of a capacitor between the plates of which there appears a potential difference of one volt when it is charged by a quantity of electricity equal to one coulomb.
Henry (H): The henry is the SI unit of inductance. It is defined as the inductance of a closed circuit in which an electromotive force of one volt is produced when the electric current in the circuit varies uniformly at a rate of one ampere per second.
Tesla (T): The tesla is the SI unit of magnetic flux density. It is defined as the magnetic flux density that induces an electromotive force of one volt in a wire loop when the magnetic flux changes at a rate of one weber per second.
Weber (Wb): The weber is the SI unit of magnetic flux. It is defined as the magnetic flux that links a circuit of one turn and induces an electromotive force of one volt when it is reduced to zero at a uniform rate in one second.
These units are essential for describing and quantifying various electrical phenomena and are used extensively in electrical engineering, physics, and related fields.