# Active Power

## active power

[′ak·tiv ′pau̇·ər]
(electricity)
The product of the voltage across a branch of an alternating-current circuit and the component of the electric current that is in phase with the voltage.

## Active Power

the average value over time of the instantaneous power of alternating current. The active power P depends on the acting values of the voltage V and the strength of the current I and on the cosine ϕ, where ϕ is the angle of phase displacement between V and I. In an electric circuit of a single-phase alternating current (sinoid), P = VI cos ϕ (for a three-phase current, P = VI cos ϕ ). The effective value can also be expressed through the strength of the current, the voltage and the active component resistance of the circuit r or its conductivity g according to the formula P = I2 x r = V2 x g. In any electric circuit of sinoidal or nonsinoidal current, the active power of the entire circuit is equal to the sum of the active power of the individual sections of the circuit. The relation between the active power and the full power S is expressed in the equation P = S cos ϕ. The unit of measurement of active power is the watt.

References in classic literature ?
As every man at heart wishes the best and not inferior society, wishes to be convicted of his error and to come to himself,--so he wishes that the same healing should not stop in his thought, but should penetrate his will or active power.
Every active power in the exuberant vital force that was in her rose in revolt against the destruction which her own will would fain have wreaked on her own life.
In the second stage, answering to the chrysalis stage of butterflies, they have six pairs of beautifully constructed natatory legs, a pair of magnificent compound eyes, and extremely complex antennae; but they have a closed and imperfect mouth, and cannot feed: their function at this stage is, to search by their well-developed organs of sense, and to reach by their active powers of swimming, a proper place on which to become attached and to undergo their final metamorphosis.
When really touched by affliction, her active powers had been all benumbed; and neither Lady Bertram nor Tom had received from her the smallest support or attempt at support.
This they would have found some difficulty in doing, had Tom continued the war single-handed, or rather single-footed, for he would have taken to the deepest part of Pebbly Brook to escape them; but, like other active powers, he was ruined by his alliances.
Our intellectual and active powers increase with our affection.
Active Power (NASDAQ: ACPW), a manufacturer of flywheel energy storage products and modular infrastructure solutions, has signed an Asset Purchase Agreement with Langley Holdings PLC, a diverse, privately owned engineering and industrial group.
Active Power (NASDAQ:ACPW), a provider of critical power solutions and uninterruptible power supply (UPS) systems, said today that Capgemini has chosen to use Active Power's PowerHouse system at its Merlin datacentre facility in Swindon, England.
Provider of critical power solutions and uninterruptible power supply (UPS) systems Active Power Inc (NASDAQ:ACPW) has received a notice of non-compliance from The Nasdaq Stock Market regarding the minimum bid price of its common stock, the company revealed on Tuesday.
A customer described as "one of the world's largest Internet Search engine providers" has placed the largest single order--12 systems--for the flywheel-based uninterruptible power supplies made by Active Power Inc.
AUSTIN, Texas -- Active Power (NASDAQ: ACPW), manufacturer of continuous power and infrastructure solutions, announced today it has renewed its global distribution agreement with its OEM partner and customer Caterpillar, Inc.
AUSTIN, Texas -- Active Power (NASDAQ: ACPW), manufacturer of continuous power and infrastructure solutions, has received a \$10 million order from one of the leading power distributors in Switzerland, Net Powersafe, representing the company's largest single order to date in terms of dollar value.

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