Home All Definitions Unit Microvolt (μV) Unit Definition

Microvolt (μV) Unit Definition

The microvolt is a multiple of the unit volt (V) for voltage. The International System of Units (SI) defines the prefix micro (μ) as a factor of one millionth or 10-6 or 0.000001. Per this definition, one microvolt is 10-6 volts. The microvolt is represented by the symbol μV.

Common Voltages

The voltage produced by each electrochemical cell in a battery is determined by the chemistry of that cell. 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 millivolts (mV)

  • Single-cell, rechargeable NiMH or NiCd battery: 1.2 V

  • Single-cell, non-rechargeable (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:

    • 100 V in Japan

    • 120 V in North America,

    • 230 V in Europe, Asia, Africa and Australia

  • Rapid transit third rail: 600–750 V

  • High-speed train overhead power lines: 25 kilovolts (kV) at 50 hertz (Hz), and 25 kV at 60 Hz for exceptions.

  • High-voltage electric power transmission lines: 110 kV and up (1.15 megavolts (MV) is the record. The highest active voltage is 1.10 MV)

  • Lightning: often around 100 MV.

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Sources

“Volt.” Wikipedia, Wikimedia Foundation, 10 Oct. 2020, en.wikipedia.org/wiki/Volt.

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