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Acceleration (m/s2)
Angle [plane] (rad)
Area (sqm)
Data Storage (B)
Data Transfer Rate (B/s)
Density (kg/m3)
Electric Charge (C)
Electric Current (A)
Electric Resistance (Ω)
Energy (J)
Force (N)
Frequency (Hz)
Fuel (km/L)
Length [m]
Mass, Weight (kg)
Mass Flow Rate (kg/s)
Power (W)
Pressure (Pa)
Speed (m/s)
Temperature (K)
Time (s)
Torque (N.m)
Volume (L)
Volume Flow Rate (m3/s)
Quantity (i)

Things that have equal numbers of electrons and protons are neutral. Things that have more electrons than protons are negatively charged, while things with fewer electrons than protons are positively charged. Things with the same charge repel each other. Things that have different charges attract each other.

Scientists measure the charge on particles by measuring how they curve when the travel in a magnetic field. For instance, a proton curves the opposite way that an electron does. A neutron does not curve at all. All else being equal, the more charge a particle has, the more it curves (i.e., the tighter the curve).

The SI unit of quantity of electric charge is the coulomb, which is equivalent to about 6.242×10

After finding the quantized character of charge, in 1891 George Stoney proposed the unit 'electron' for this fundamental unit of electrical charge. This was before the discovery of the particle by J.J. Thomson in 1897. The unit is today treated as nameless, referred to as "elementary charge", "fundamental unit of charge", or simply as "e". A measure of charge should be a multiple of the elementary charge e, even if at large scales charge seems to behave as a real quantity. In some contexts it is meaningful to speak of fractions of a charge; for example in the charging of a capacitor, or in the fractional quantum Hall effect.

The unit faraday is sometimes used in electrochemistry. One faraday of charge is the magnitude of the charge of one mole of electrons, i.e. 96485.33289(59) C.

In systems of units other than SI such as cgs, electric charge is expressed as combination of only three fundamental quantities (length, mass, and time), and not four, as in SI, where electric charge is a combination of length, mass, time, and electric current.

- Abcoulombs (abC) ⇛
- Amperes Hour (Ah) ⇛
- Amperes Minute (Amin) ⇛
- Amperes Second (As) ⇛
- Attocoulombs (aC) ⇛
- Centicoulombs (cC) ⇛
- Coulombs (C) ⇛
- Decacoulombs (daC) ⇛
- Decicoulombs (dC) ⇛
- Electromagnetic Units Of Charge (EMU) ⇛
- Electron Charge (e-) ⇛
- Electrostatic Units Of Charge (ESU) ⇛
- Elementary Charge (e,q) ⇛
- Emu Of Charge (emu) ⇛
- Esu Of Charge (esu) ⇛
- Exacoulombs (EC) ⇛
- Faradays (frs) ⇛
- Femtocoulombs (fC) ⇛
- Franklins (Fr) ⇛
- Gigacoulombs (GC) ⇛
- Kilocoulombs (kC) ⇛
- Megacoulombs (MC) ⇛
- Microcoulombs (µC) ⇛
- Millicoulombs (mC) ⇛
- Nanocoulombs (nC) ⇛
- Petacoulombs (PC) ⇛
- Picocoulombs (pC) ⇛
- Planck Charge (qp) ⇛
- Statcoulombs (stC) ⇛
- Teracoulombs (TC) ⇛

- Abcoulombs -> Amperes Minute
- Amperes Minute -> Abcoulombs
- Faradays -> Attocoulombs
- Attocoulombs -> Faradays
- Elementary Charge -> Picocoulombs
- Picocoulombs -> Elementary Charge
- Kilocoulombs -> Amperes Second
- Amperes Second -> Kilocoulombs
- Gigacoulombs -> Megacoulombs
- Megacoulombs -> Gigacoulombs
- Electrostatic Units Of Charge -> Centicoulombs
- Centicoulombs -> Electrostatic Units Of Charge
- Teracoulombs -> Decicoulombs
- Decicoulombs -> Teracoulombs
- Nanocoulombs -> Esu Of Charge
- Esu Of Charge -> Nanocoulombs
- Coulombs -> Millicoulombs
- Millicoulombs -> Coulombs
- Emu Of Charge -> Electromagnetic Units Of Charge
- Electromagnetic Units Of Charge -> Emu Of Charge