Ampere (A)
Definition: The SI base unit of electric current.
History: Named after French physicist André-Marie Ampère.
Current Use: Standard unit for measuring electric current.
Kiloampere (kA)
Definition: A unit of electric current equal to 1000 amperes.
History: Used for high-current applications.
Current Use: Used in industrial and power systems.
Milliampere (mA)
Definition: A unit of electric current equal to one thousandth of an ampere.
History: Used for small current measurements.
Current Use: Common in electronics and medical devices.
Microampere (μA)
Definition: A unit of electric current equal to one millionth of an ampere.
History: Used for very small current measurements.
Current Use: Used in precision electronics and sensors.
Nanoampere (nA)
Definition: A unit of electric current equal to one billionth of an ampere.
History: Used for extremely small current measurements.
Current Use: Used in advanced electronics and research.
Volt (V)
Definition: The SI unit of electric potential difference.
History: Named after Italian physicist Alessandro Volta.
Current Use: Standard unit for measuring voltage.
Millivolt (mV)
Definition: A unit of electric potential equal to one thousandth of a volt.
History: Used for small voltage measurements.
Current Use: Common in electronics and instrumentation.
Kilovolt (kV)
Definition: A unit of electric potential equal to 1000 volts.
History: Used for high voltage applications.
Current Use: Used in power transmission and distribution.
Megavolt (MV)
Definition: A unit of electric potential equal to one million volts.
History: Used for very high voltage applications.
Current Use: Used in particle accelerators and high-energy physics.
Microvolt (µV)
Definition: A unit of electric potential equal to one millionth of a volt.
History: Used for very small voltage measurements.
Current Use: Used in precision electronics and medical devices.
Farad (F)
Definition: The SI unit of electrical capacitance.
History: Named after Michael Faraday.
Current Use: Measures capacitor capacity in electrical circuits.
Millifarad (mF)
Definition: A unit of capacitance equal to one thousandth of a farad.
History: Metric submultiple of the farad.
Current Use: Used for relatively large capacitors compared to microfarads.
Microfarad (μF)
Definition: A unit of capacitance equal to one millionth of a farad.
History: Very common in electronics.
Current Use: Typical value for signal and power capacitors.
Nanofarad (nF)
Definition: A unit of capacitance equal to one billionth of a farad.
History: Metric submultiple of the farad.
Current Use: Used in filters and higher-frequency circuits.
Picofarad (pF)
Definition: A unit of capacitance equal to one trillionth of a farad.
History: Metric submultiple of the farad.
Current Use: Used for high-frequency and RF capacitors.
Henry (H)
Definition: The SI unit of electrical inductance.
History: Named after American scientist Joseph Henry.
Current Use: Measures inductance of coils and inductors.
Millihenry (mH)
Definition: A unit of inductance equal to one thousandth of a henry.
History: Metric submultiple of the henry.
Current Use: Common in signal and power filters.
Microhenry (μH)
Definition: A unit of inductance equal to one millionth of a henry.
History: Metric submultiple of the henry.
Current Use: Used in high-frequency and RF circuits.
Nanohenry (nH)
Definition: A unit of inductance equal to one billionth of a henry.
History: Metric submultiple of the henry.
Current Use: Used in RF and microwave components.
Ohm (Ω)
Definition: The SI unit of electrical resistance.
History: Named after German physicist Georg Ohm.
Current Use: Used to measure resistance of components and circuits.
Milliohm (mΩ)
Definition: A unit of electrical resistance equal to one thousandth of an ohm.
History: Metric submultiple of the ohm.
Current Use: Used for very low resistance measurements.
Kiloohm (kΩ)
Definition: A unit of electrical resistance equal to one thousand ohms.
History: Metric multiple of the ohm.
Current Use: Common in electronics and analog circuits.
Megaohm (MΩ)
Definition: A unit of electrical resistance equal to one million ohms.
History: Metric multiple of the ohm.
Current Use: Used for high-resistance materials and insulation.
Siemens (S)
Definition: The SI unit of electrical conductance; the reciprocal of the ohm.
History: Named after Werner von Siemens.
Current Use: Used to measure conductance of circuits and solutions.
Millisiemens (mS)
Definition: A unit of conductance equal to one thousandth of a siemens.
History: Metric submultiple of the siemens.
Current Use: Common in solution conductivity and electronics.
Microsiemens (μS)
Definition: A unit of conductance equal to one millionth of a siemens.
History: Metric submultiple of the siemens.
Current Use: Used for very low conductance measurements (e.g., water quality).
Mho (℧)
Definition: An older name for electrical conductance (now siemens); reciprocal of the ohm.
History: Historically used before adoption of the siemens.
Current Use: Occasionally appears in legacy literature.