Value of an expression without regard to sign or phase angle.

The temperature where thermal energy is at minimum. -273.15°C or 0 Kelvin.

[see alternating current]

A device, other than current using equipment, associated with such equipment or with the wiring of an installation.

Rate of change of velocity. [Unit: m/s2]

Acceleration of a body falling freely in a vacuum as a result of the gravitational pull of the earth. g = 9.807 m/s2

Storage battery or secondary cell for storing electricity.

Specifies the nearness of the measured value from the true value.

Containing an excess of hydrogen ions over hydroxyl ions.

Study of sound.