HP BL260c Power basics for IT professionals - Page 35

Glossary, American National Standards Institute ANSI: A private

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Glossary A: ampere AC: Alternating current Alternating current (AC): An electric current that reverses flow (positive or negative polarity) in a cyclical manner that resembles a sine wave. American National Standards Institute (ANSI): A private, non-profit standards organization that produces industrial standards in the United States, ANSI is a member of IEC. (For the ANSI website, see http://www.ansi.org/) American Wire Gauge (AWG): A common standard of measurement for the diameter of wires, especially electric-conductive wires. Ampere (A): As a unit of measurement, current is defined as electrical charge over time. One ampere of current will flow when one volt is applied over one ohm of resistance. Amplitude: In AC power transmission, amplitude is the measurement (from zero to peak) of the sine wave that describes either current or voltage. ANSI: American National Standards Institute Apparent power: Expressed in volt-amps, apparent power is measured as voltage multiplied by amperes. See Power factor correction. Auto-sensing: The ability of a server to automatically detect and adjust for the proper input voltage supplied by the power utility (low-voltage or high-voltage). AWG: American Wire Gauge Blade server: see server blade. Branch circuit: The circuit that originates at the distribution panel and goes to the plugs in the data center. Breaker: A switch or attachment point on a power distribution panel that interrupts power in the event that too much current is being drawn by the device it is protecting (for example, due to an internal short circuit). Bridge: A circuit that is used to measure small quantities of current (amperes), voltage (volts) or resistance (ohms). Bridge rectifier: A circuit that is used to change alternating current (AC) to rectified AC current, which does not have a negative waveform. British Thermal Unit (BTU): The amount of heat required to raise one pound (avoirdupois) of water one degree Fahrenheit. BTU: British Thermal Unit Buildup: A gradual increase in voltage (volts). Bus bars: Flat strips of copper or other material that conduct electricity around an electrical device. The shape of bus bars allows heat to dissipate efficiently. Rack bus bars deliver up to 3,000 watts of DC power from power enclosures to server enclosures. Canadian Standards Association (CSA): The nonprofit organization that operates a listing service for electrical materials and equipment. It is the Canadian counterpart to Underwriters Laboratories. 35

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Glossary
A: ampere
AC: Alternating current
Alternating current (AC): An electric current that reverses flow (positive or negative polarity) in a
cyclical manner that resembles a sine wave.
American National Standards Institute (ANSI): A private, non-profit standards organization that
produces industrial standards in the United States, ANSI is a member of IEC. (For the ANSI website,
see
)
American Wire Gauge (AWG): A common standard of measurement for the diameter of wires,
especially electric-conductive wires.
Ampere (A): As a unit of measurement, current is defined as electrical charge over time. One ampere
of current will flow when one volt is applied over one ohm of resistance.
Amplitude: In AC power transmission, amplitude is the measurement (from zero to peak) of the sine
wave that describes either current or voltage.
ANSI: American National Standards Institute
Apparent power: Expressed in volt-amps, apparent power is measured as voltage multiplied by
amperes. See Power factor correction.
Auto-sensing: The ability of a server to automatically detect and adjust for the proper input voltage
supplied by the power utility (low-voltage or high-voltage).
AWG: American Wire Gauge
Blade server: see server blade.
Branch circuit:
The circuit that originates at the distribution panel and goes to the plugs in the data
center.
Breaker: A switch or attachment point on a power distribution panel that interrupts power in the event
that too much current is being drawn by the device it is protecting (for example, due to an internal
short circuit).
Bridge: A circuit that is used to measure small quantities of current (amperes), voltage (volts) or
resistance (ohms).
Bridge rectifier: A circuit that is used to change alternating current (AC) to rectified AC current, which
does not have a negative waveform.
British Thermal Unit (BTU): The amount of heat required to raise one pound (avoirdupois) of water one
degree Fahrenheit.
BTU: British Thermal Unit
Buildup: A gradual increase in voltage (volts).
Bus bars: Flat strips of copper or other material that conduct electricity around an electrical device.
The shape of bus bars allows heat to dissipate efficiently. Rack bus bars deliver up to 3,000 watts of
DC power from power enclosures to server enclosures.
Canadian Standards Association (CSA): The nonprofit organization that operates a listing service for
electrical materials and equipment.
It is the Canadian counterpart to Underwriters Laboratories.
35