Electrical & electronic units of electric current, voltage, power, resistance, capacitance, inductance, electric charge, electric field, magnetic flux, frequency:
Electrical & electronic units table
Unit Name  Unit Symbol  Quantity 

Ampere (amp)  A  Electric current (I) 
Volt  V  Voltage (V, E) Electromotive force (E) Potential difference (Δφ) 
Ohm  Ω  Resistance (R) 
Watt  W  Electric power (P) 
Decibelmilliwatt  dBm  Electric power (P) 
DecibelWatt  dBW  Electric power (P) 
VoltAmpereReactive  var  Reactive power (Q) 
VoltAmpere  VA  Apparent power (S) 
Farad  F  Capacitance (C) 
Henry  H  Inductance (L) 
siemens / mho  S  Conductance (G) Admittance (Y) 
Coulomb  C  Electric charge (Q) 
Amperehour  Ah  Electric charge (Q) 
Joule  J  Energy (E) 
Kilowatthour  kWh  Energy (E) 
Electronvolt  eV  Energy (E) 
Ohmmeter  Ω∙m  Resistivity (ρ) 
siemens per meter  S/m  Conductivity (σ) 
Volts per meter  V/m  Electric field (E) 
Newtons per coulomb  N/C  Electric field (E) 
Voltmeter  V⋅m  Electric flux (Φ_{e}) 
Tesla  T  Magnetic field (B) 
Gauss  G  Magnetic field (B) 
Weber  Wb  Magnetic flux (Φ_{m}) 
Hertz  Hz  Frequency (f) 
Seconds  s  Time (t) 
Meter / metre  m  Length (l) 
Squaremeter  m^{2}  Area (A) 
Decibel  dB  
Parts per million  ppm 
Units prefix table
Prefix

Prefix Symbol 
Prefix factor 
Example 

pico  p  10^{12}  1pF = 10^{12}F 
nano  n  10^{9}  1nF = 10^{9}F 
micro  μ  10^{6}  1μA = 10^{6}A 
milli  m  10^{3}  1mA = 10^{3}A 
kilo  k  10^{ 3}  1kΩ = 1000Ω 
mega  M  10^{ 6}  1MHz = 10^{6}Hz 
giga  G  10^{ 9}  1GHz = 10^{9}Hz 
Electrical units definitions
Volt (V)
Volt is the electrical unit of voltage.
One volt is the energy of 1 joule that is consumed when electric charge of 1 coulomb flows in the circuit.
1V = 1J / 1C
Ampere (A)
Ampere is the electrical unit of electrical current. It measures the amount of electrical charge that flows in an electrical circuit per 1 second.
1A = 1C / 1s
Ohm (Ω)
Ohm is the electrical unit of resistance.
1Ω = 1V / 1A
Watt (W)
Watt is the electrical unit of electric power. It measures the rate of consumed energy.
1W = 1J / 1s
1W = 1V ⋅ 1A
Decibelmilliwatt (dBm)
Decibelmilliwatt or dBm is a unit of electric power, measured with logarithmic scale referenced to 1mW.
10dBm = 10 ⋅ log_{10}(10mW / 1mW)
DecibelWatt (dBW)
Decibelwatt or dBW is a unit of electric power, measured with logarithmic scale referenced to 1W.
10dBW = 10 ⋅ log_{10}(10W / 1W)
Farad (F)
Farad is the unit of capacitance. It represents the amount of electric charge in coulombs that is stored per 1 volt.
1F = 1C / 1V
Henry (H)
Henry is the unit of inductance.
1H = 1Wb / 1A
siemens (S)
siemens is the unit of conductance, which is the opposite of resistance.
1S = 1 / 1Ω
Coulomb (C)
Coulomb is the unit of electric charge.
1C = 6.238792×10^{18} electron charges
Amperehour (Ah)
Amperehour is a unit of electric charge.
One amperehour is the electric charge that flow in electrical circuit, when a current of 1 ampere is applied for 1 hour.
1Ah = 1A ⋅ 1hour
One amperehour is equal to 3600 coulombs.
1Ah = 3600C
Tesla (T)
Tesla is the unit of magnetic field.
1T = 1Wb / 1m^{2}
Weber (Wb)
Weber is the unit of magnetic flux.
1Wb = 1V ⋅ 1s
Joule (J)
Joule is the unit of energy.
1J = 1 kg ⋅ m^{2} / s^{2}
Kilowatthour (kWh)
Kilowatthour is a unit of energy.
1kWh = 1kW ⋅ 1h = 1000W ⋅ 1h
Kilovoltamps (kVA)
Kilovoltamps is a unit of power.
1kVA = 1kV ⋅ 1A = 1000 ⋅ 1V ⋅ 1A
Hertz (Hz)
Hertz is the unit of frequency. It measures the number of cycles per second.
1 Hz = 1 cycles / s
Currently, we have around 1975 calculators, conversion tables and usefull online tools and software features for students, teaching and teachers, designers and simply for everyone.
You can find at this page financial calculators, mortgage calculators, calculators for loans, calculators for auto loan and lease calculators, interest calculators, payment calculators, retirement calculators, amortization calculators, investment calculators, inflation calculators, finance calculators, income tax calculators, compound interest calculators, salary calculator, interest rate calculator, sales tax calculator, fitness & health calculators, bmi calculator, calorie calculators, body fat calculator, bmr calculator, ideal weight calculator, pace calculator, pregnancy calculator, pregnancy conception calculator, due date calculator, math calculators, scientific calculator, fraction calculator, percentage calculators, random number generator, triangle calculator, standard deviation calculator, other calculators, age calculator, date calculator, time calculator, hours calculator, gpa calculator, grade calculator, concrete calculator, subnet calculator, password generator conversion calculator and many other tools and for text editing and formating, downloading videos from Facebok (we built one of the most famous Facebook video downloader online tools). We also provide you online downloanders for YouTube, Linkedin, Instagram, Twitter, Snapchat, TikTok and other social media sites (please note we does not host any videos on its servers. All videos that you download are downloaded from Facebook's, YouTube's, Linkedin's, Instagram's, Twitter's, Snapchat's, TikTok's CDNs. We also specialise on keyboard shortcuts, ALT codes for Mac, Windows and Linux and other usefull hints and tools (how to write emoji online etc.)
There are many very usefull online free tools and we would be happy if you share our page to others or send us any suggestions for other tools which will come on your mind. Also in case you find any of our tools that it does not work properly or need a better translation  please let us know. Our tools will make your life easier or simply help you to do your work or duties faster and in more effective way.
These below are the most commonly used by many users all over the world.
 Free online calculators and tools
 Free online units conversion tools
 Free online web design tools
 Free online electricity & electronics tools
 Mathematics
 Online Tools
 Text Tools
 PDF Tools
 Code
 Ecology
 Others
 Basic Electrical Terms
 Electrical & Electronic Units
 Electronic Components
 Electrical & Electronic Symbols
 Electronic Circuit Laws
And we are still developing more. Our goal is to become the onestop, goto site for people who need to make quick calculations or who need to find quick answer for basic conversions.
Additionally, we believe the internet should be a source of free information. Therefore, all of our tools and services are completely free, with no registration required. We coded and developed each calculator individually and put each one through strict, comprehensive testing. However, please inform us if you notice even the slightest error – your input is extremely valuable to us. While most calculators on Justfreetools.com are designed to be universally applicable for worldwide usage, some are for specific countries only.