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i Section Page Complex power, power factor, power factor correction
i Section Page Complex power, power factor, power factor correction

... For sinusoidal signals the power factor is defined by pf=cosq where q is the phase angle of the voltage or current relative to some reference. For power circuits, the generator (or line) voltage is usually taken as the reference since the loads are usually connected in parallel. For phasors we can d ...
Three Phase Power Calculations File
Three Phase Power Calculations File

... Unbalanced Three Phase Systems  An unbalanced system is due to unbalanced voltage sources or unbalanced load. In a unbalanced system the neutral current is NOT zero. ...
Three Phase Power Calculations File
Three Phase Power Calculations File

... Unbalanced Three Phase Systems  An unbalanced system is due to unbalanced voltage sources or unbalanced load. In a unbalanced system the neutral current is NOT zero. ...
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... without regulation and generally with low drive capability. The advantages of charge-pumps include low quiescent current and high efficiency under light loads: the operating regime of the ...
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... Equation 3 is in error by almost 16 dB! This should point out the need for caution in ensuring that impedance levels are constant when using voltage (or current) for decibel calculations. Remember that an audio (or RF) voltmeter doesn't know what the impedance of the circuit is; it simply registers ...
Recommending a Strategy
Recommending a Strategy

... Ultimate goal is to supply loads with electricity at constant frequency and voltage Electrical characteristics of individual loads matter, but usually they can only be estimated ...
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Data Center Infrastructure Management: How to Optimize Data Center Operations

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Power Devices and ICs

Anant Kumar Tiwari, Miss. Durga Sharma, Mr.Vijay Kumar Sharma
Anant Kumar Tiwari, Miss. Durga Sharma, Mr.Vijay Kumar Sharma

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A044040108

... voltage stability which can ultimately result in detrimental effects on the life of sensitive electronic equipment or even intermittent malfunction. Voltage transients created by DC drive SCR line notching, AC drive voltage chopping, and high frequency harmonic voltages and currents are all signific ...
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< 1 ... 93 94 95 96 97 98 99 100 101 ... 159 >

Standby power

Standby power, also called vampire power, vampire draw, phantom load, or leaking electricity (""phantom load"" and ""leaking electricity"" are defined technical terms with other meanings, adopted for this different purpose), refers to the electric power consumed by electronic and electrical appliances while they are switched off (but are designed to draw some power) or in a standby mode. This only occurs because some devices claimed to be ""switched off"" on the electronic interface, but are in a different state from switching off at the plug, or disconnecting from the power point, which can solve the problem of standby power completely. In fact, switching off at the power point is effective enough, there is no need to disconnect all devices from the power point. Some such devices offer remote controls and digital clock features to the user, while other devices, such as power adapters for disconnected electronic devices, consume power without offering any features (sometimes called no-load power). All of the above examples, such as the remote control, digital clock functions and—in the case of adapters, no-load power—are switched off just by switching off at the power point. However, for some devices with built-in internal battery, such as a phone, the standby functions can be stopped by removing the battery instead.In the past, standby power was largely a non-issue for users, electricity providers, manufacturers, and government regulators. In the first decade of the twenty-first century, awareness of the issue grew and it became an important consideration for all parties. Up to the middle of the decade, standby power was often several watts or even tens of watts per appliance. By 2010, regulations were in place in most developed countries restricting standby power of devices sold to one watt (and half that from 2013).
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