HP DL360 Power basics for IT professionals - Page 36

and the United Kingdom. Albania, Bosnia/Herzegovina, Bulgaria, Croatia, Romania, Turkey

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Capacitance: The ability to store an electrical charge, measured in farads. See Farad. CEE: Abbreviated from International Commission for Conformity Certification of Electrical Equipment, subsumed in 1985 into the International Electrotechnical Commission (IEC). See International Electrotechnical Commission. CENELEC: Comité Européen de Normalisation Electrotechnique, see below. Circuit: A conductor through which electrical current flows, or more practically, a combination of electrical components that have been assembled to perform a function. Circuit breaker: An automatic switch (of varying capacities and behaviors) used to open (disconnect) a closed (connected) circuit during a power surge to protect other devices attached to the circuit. Coil: Made of wound or wrapped wires, inductance coils are used to store energy or regulate a change in current. Cold aisle: The data center aisle(s) where greatest air-conditioning flow travels toward the servers. Using best practices, cold aisles alternate with hot aisles in data centers. Comité Européen de Normalisation Electrotechnique (CENELEC): The European Committee for Electrotechnical Standardization; its members are the national electrotechnical standardization bodies of most European countries: Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Spain, Slovakia, Slovenia, Sweden, Switzerland and the United Kingdom. Albania, Bosnia/Herzegovina, Bulgaria, Croatia, Romania, Turkey and Ukraine are now affiliate members with a view to becoming full members. For the CENELEC website, see http://www.cenelec.org. Conductance, conductivity: The ability to conduct electric current, measured as the opposite or the inverse of resistance (one divided by ohms). Conductor: Any material that conveys an electric current. Connector: A power plug contact. Contact: A power plug contact. Cord: Main section of insulated wires of varying length and of a thickness determined by its current rating between two connectors. Core: A power plug contact. CSA: Canadian Standards Association Current: The rate of flow of charge (potential difference, voltage) in an electrical circuit. Current is expressed in amperes. DC: Direct current. Delta connection: A type of connection in three-phase electrical wiring where the three wires are connected in a manner represented by a triangle resembling the Greek letter delta. See Wye connection. Diode: The electronic version of a one-way valve, a diode allows electric current in one direction but prevents it from flowing in the opposite direction. Direct current (DC): An electric current that moves in only one direction in a given circuit. Distribution panel: After the power meter, incoming power cables run by conduit to the main power distribution panel (formerly called the fuse box) where rocker switches serve as circuit breakers at the origin point of all internal circuits. 36

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Capacitance: The ability to store an electrical charge, measured in farads. See Farad.
CEE: Abbreviated from International Commission for Conformity Certification of Electrical Equipment,
subsumed in 1985 into the International Electrotechnical Commission (IEC). See International
Electrotechnical Commission.
CENELEC: Comité Européen de Normalisation Electrotechnique, see below.
Circuit: A conductor through which electrical current flows, or more practically, a combination of
electrical components that have been assembled to perform a function.
Circuit breaker: An automatic switch (of varying capacities and behaviors) used to open (disconnect)
a closed (connected) circuit during a power surge to protect other devices attached to the circuit.
Coil: Made of wound or wrapped wires, inductance coils are used to store energy or regulate a
change in current.
Cold aisle: The data center aisle(s) where greatest air-conditioning flow travels toward the servers.
Using best practices, cold aisles alternate with hot aisles in data centers.
Comité Européen de Normalisation Electrotechnique (CENELEC): The European Committee for
Electrotechnical Standardization; its members are the national electrotechnical standardization bodies
of most European countries: Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,
Malta, the Netherlands, Norway, Poland, Portugal, Spain, Slovakia, Slovenia, Sweden, Switzerland
and the United Kingdom. Albania, Bosnia/Herzegovina, Bulgaria, Croatia, Romania, Turkey and
Ukraine are now affiliate members with a view to becoming full members. For the CENELEC website,
see
.
Conductance, conductivity: The ability to conduct electric current, measured as the opposite or the
inverse of resistance (one divided by ohms).
Conductor: Any material that conveys an electric current.
Connector: A power plug contact.
Contact: A power plug contact.
Cord:
Main section of insulated wires of varying length and of a thickness determined by its current
rating between two connectors.
Core: A power plug contact.
CSA: Canadian Standards Association
Current: The rate of flow of charge (potential difference, voltage) in an electrical circuit. Current is
expressed in amperes.
DC: Direct current.
Delta connection: A type of connection in three-phase electrical wiring where the three wires are
connected in a manner represented by a triangle resembling the Greek letter delta. See Wye
connection.
Diode: The electronic version of a one-way valve, a diode allows electric current in one direction but
prevents it from flowing in the opposite direction.
Direct current (DC): An electric current that moves in only one direction in a given circuit.
Distribution panel: After the power meter, incoming power cables run by conduit to the main power
distribution panel (formerly called the fuse box) where rocker switches serve as circuit breakers at the
origin point of all internal circuits.
36