One volt is defined as the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. Equivalently, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can be expressed in terms of SI base units (m, kg, s, and A) as:
It can also be expressed as amperes times ohms (current times resistance, Ohm's law), webers per second (magnetic flux per time), watts per ampere (power per unit current, definition of electric power), or joules per coulomb (energy per unit charge), which is also equivalent to electronvolts per elementary charge:
One Volt is defined as energy consumption of one joule per electric charge of one coulomb.
1V = 1J/C
One volt is equal to current of 1 amp times resistance of 1 ohm:
1V = 1A ⋅ 1Ω
The Volt unit is named after Alessandro Volta, an Italian physicist who invented an electric battery.
Volt subunits and conversion table
|microvolt||μV||1μV = 10-6V||V = 30μV|
|millivolt||mV||1mV = 10-3V||V = 5mV|
|V = 10V|
|kilovolt||kV||1kV = 103V||V = 2kV|
|megavolt||MV||1MV = 106V||V = 5MV|
Volts to watts conversion
The power in watts (W) is equal to the voltage in volts (V) times the current in amps (A):
watts (W) = volts (V) × amps (A)
Volts to joules conversion
The energy in joules (J) is equal to the voltage in volts (V) times the electric charge in coulombs (C):
joules (J) = volts (V) × coulombs (C)
Volts to amps conversion
The current in amps (A) is equal to the voltage in volts (V) divided by the resistance in ohms (Ω):
amps (A) = volts (V) / ohms(Ω)
The current in amps (A) is equal to the power in watts (W) divided by the voltage in volts (V):
amps (A) = watts (W) / volts (V)
Volts to electron-volts conversion
The energy in electronvolts (eV) is equal to the potential difference or voltage in volts (V) times the electric charge in electron charges (e):
electronvolts (eV) = volts (V) × electron-charge (e)
= volts (V) × 1.602176e-19 coulombs (C)
The voltage produced by each electrochemical cell in a battery is determined by the chemistry of that cell (see Galvanic cell § Cell voltage). Cells can be combined in series for multiples of that voltage, or additional circuitry added to adjust the voltage to a different level. Mechanical generators can usually be constructed to any voltage in a range of feasibility.
Nominal voltages of familiar sources:
- Nerve cell resting potential: ~75 mV
- Single-cell, rechargeable NiMH or NiCd battery: 1.2 V
- Single-cell, non-rechargeable (e.g., AAA, AA, C and D cells): alkaline battery: 1.5 V; zinc-carbon battery: 1.56 V if fresh and unused
- LiFePO4 rechargeable battery: 3.3 V
- Cobalt-based Lithium polymer rechargeable battery: 3.75 V (see Comparison of commercial battery types)
- Transistor-transistor logic/CMOS (TTL) power supply: 5 V
- USB: 5 V DC
- PP3 battery: 9 V
- Automobile battery systems are 2.1 volts per cell; a "12V" battery is 6 cells or 12.6V; a "24V" battery is 12 cells or 25.2V. Some antique vehicles use "6V" 3-cell batteries or 6.3 volts.
- Household mains electricity AC: (see List of countries with mains power plugs, voltages and frequencies)
- 100 V in Japan
- 120 V in North America,
- 230 V in Europe, Asia, Africa and Australia
- Rapid transit third rail: 600–750 V (see List of railway electrification systems)
- High-speed train overhead power lines: 25 kV at 50 Hz, but see the List of railway electrification systems and 25 kV at 60 Hz for exceptions.
- High-voltage electric power transmission lines: 110 kV and up (1.15 MV is the record; the highest active voltage is 1.10 MV)
- Lightning:, often around 100 MV.
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
- Online Tools
- Text Tools
- PDF Tools
- Basic Electrical Terms
- Electrical & Electronic Units
- Electronic Components
- Electrical & Electronic Symbols
- Electronic Circuit Laws
- Ampere (A)
- Decibel (dB)
- Decibel-milliwatt (dBm)
- Decibel-Watt (dBW)
- Farad (F)
- Joule (J) unit
- Kilovolt-amp (kVA)
- Kilowatt (kW)
- Kilowatt-hour (kWh)
- Lumen (lm) unit
- Lux unit definition
- Ohm (Ω)
- Volt (V)
- Watt (W)
And we are still developing more. Our goal is to become the one-stop, go-to 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.