HP BL260c Power basics for IT professionals - Page 43

systems VA = E × I, where E, See Delta connection.

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Uninterruptible power supply (UPS): A UPS is a battery-powered device that acts like a power supply for computers or servers during a power outage. A UPS typically extends uptime from 7 to 40 minutes or more (depending on server power loads and UPS configuration options). UPS: Uninterruptible power supply. VA: Volt-ampere. A rating of apparent power (i.e., the amount of AC power that is available to or can be handled by utility equipment) measured with a voltmeter and an ammeter. In single-phase systems VA = E × I, where E = volts, I = current in amperes. In three-phase systems VA = 1.73×E × I. Volt (V): A unit of electrical flow. A volt is the difference of potential required to make an electric current of one ampere flow through a resistance of one ohm. Volt-ampere (VA): The unit of electric current that equals one ampere under a pressure of one volt. Voltage: The most commonly used term for electric flow. Voltage quantifies the electric pressure (difference in potential) between two points that is capable of producing a flow of electric current when a closed circuit connects the two points. Voltage rating: The highest voltage that may be continuously applied to a wire or cord, in conformance with standards or specifications. W: watt. A rating of true power consumed by the product and measured with an input power meter. In single-phase systems W = E x I x pf, where E = volts, I = current in amperes, and pf = power factor. watt: A unit of measurement of electrical power or work. One watt equals the flow of one ampere under a pressure of one volt (one VA or volt-ampere). watt-hours (Wh): A measurement for work that has been done over time. Wh: watt-hour Wye Connection: A type of connection in three-phase electrical wiring that resembles the letter Y. See Delta connection. Zero potential: Electrical grounding provides this reference voltage level (also called ground potential). 43

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Uninterruptible power supply (UPS): A UPS is a battery-powered device that acts like a power supply
for computers or servers during a power outage. A UPS typically extends uptime from 7 to 40 minutes
or more (depending on server power loads and UPS configuration options).
UPS: Uninterruptible power supply.
VA: Volt-ampere. A rating of apparent power (i.e., the amount of AC power that is available to or
can be handled by utility equipment) measured with a voltmeter and an ammeter. In single-phase
systems VA = E × I, where E
= volts, I = current in amperes. In three-phase systems VA = 1.73×E × I.
Volt (V): A unit of electrical flow. A volt is the difference of potential required to make an electric
current of one ampere flow through a resistance of one ohm.
Volt-ampere (VA): The unit of electric current that equals one ampere under a pressure of one volt.
Voltage: The most commonly used term for electric flow. Voltage quantifies the electric pressure
(difference in potential) between two points that is capable of producing a flow of electric current
when a closed circuit connects the two points.
Voltage rating: The highest voltage that may be continuously applied to a wire or cord, in
conformance with standards or specifications.
W: watt. A rating of true power consumed by the product and measured with an input power meter.
In single-phase systems W = E x I x pf, where E = volts, I = current in amperes, and pf = power
factor.
watt: A unit of measurement of electrical power or work. One watt equals the flow of one ampere
under a pressure of one volt (one VA or volt-ampere).
watt-hours (Wh): A measurement for work that has been done over time.
Wh: watt-hour
Wye Connection:
A type of connection in three-phase electrical wiring that resembles the letter Y.
See Delta connection.
Zero potential: Electrical grounding provides this reference voltage level (also called ground
potential).
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