page_title: Volt
section_title: Common voltages
hierarchical_section_title: Volt / Common voltages
caption_attribution_description: size R-14 (C) alkaline disposable battery
context_page_description: The volt is the SI derived unit of electric potential difference or electromotive force. It is named in honor of the Italian physicist Alessandro Volta, who invented the voltaic pile, the first chemical battery.
context_section_description: Nominal voltages of familiar sources:
  Nerve cell action potential: around 30 mV
  Single-cell, rechargeable NiMH or NiCd battery: 1.2 V
  Mercury battery 1.355 V
  Single-cell, non-rechargeable alkaline battery (e.g. AAA, AA, C and D cells): 1.5 V
  Lithium polymer rechargeable battery: 3.75 V
  Transistor-transistor logic (TTL) power supply: 5 V
  PP3 battery: 9 V
  Automobile electrical system: 12 V (nominal)
  Household mains electricity: 230 V RMS in Europe, Australia, Asia and Africa, 120 V RMS in North America, 100 V RMS in Japan (see List of countries with mains power plugs, voltages and frequencies)
  Rapid transit third rail: 600 to 700 V (see List of current systems for electric rail traction)
  High speed train overhead power lines: 25 kV RMS at 50 Hz, but see List of current systems for electric rail traction for exceptions.
  High voltage electric power transmission lines: 110 kV RMS and up (1150 kV RMS is the record as of 2005)
  Lightning: Varies greatly, often around 100 MV.
  Note: Where 'RMS' (root mean square) is stated above, the peak voltage is  times greater than the RMS voltage for a sinusoidal signal.
caption: 1.5 V C-cell batteries
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