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2. Volt-ampere - Wikipedia

   en.wikipedia.org/wiki/Volt-ampere

   The unit "var" is allowed by the International System of Units (SI) even though the unit var is representative of a form of power. [8] Per EU directive 80/181/EEC (the "metric directive"), the correct symbol is lower-case "var", [ 1 ] although the spellings "Var" and "VAr" are commonly seen, and "VAR" is widely used throughout the power industry.

3. Per-unit system - Wikipedia

   en.wikipedia.org/wiki/Per-unit_system

   In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to the other.

4. Ampere-hour - Wikipedia

   en.wikipedia.org/wiki/Ampere-hour

   An ampere-hour or amp-hour (symbol: A⋅h or A h; often simplified as Ah) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs. [1] [2]

5. Power (physics) - Wikipedia

   en.wikipedia.org/wiki/Power_(physics)

   Power is the amount of energy transferred or converted per unit time. In the International System of Units , the unit of power is the watt , equal to one joule per second. Power is a scalar quantity.

6. Ampere - Wikipedia

   en.wikipedia.org/wiki/Ampere

   The ampere is named for French physicist and mathematician André-Marie Ampère (1775–1836), who studied electromagnetism and laid the foundation of electrodynamics.In recognition of Ampère's contributions to the creation of modern electrical science, an international convention, signed at the 1881 International Exposition of Electricity, established the ampere as a standard unit of ...

7. Gain (electronics) - Wikipedia

   en.wikipedia.org/wiki/Gain_(electronics)

   What is its voltage and power gain? A. Voltage gain is simply: = = = . The units V/V are optional but make it clear that this figure is a voltage gain and not a power gain. Using the expression for power, P = V 2 /R, the power gain is: