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Apparent Power |
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apparent power [ə′pa·rənt ′pau̇·ər]
(electricity) The product of the root-mean-square voltage and the root-mean-square current delivered in an alternating-current circuit, no account being taken of the phase difference between voltage and current. Apparent Power a quantity that is equal to the product of the effective values of the periodic electric current I in a circuit and of the voltage U across the terminals of the circuit: S = UI. For a sinusoidal current (in complex form), S͂ = U̇İ, where U̇ is the complex effective value of the voltage and İ is the conjugate of the complex effective value of the current. S͂ = P + jQ, where P is the active power and Q is the reactive power; for inductive loads, Q > 0, and for capacitive loads, Q< 0. Apparent power is measured in volt-amperes. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | The AC powered PoE media converter utilizes an external AC power supply, allowing for a reduced form factor. Over the past 100 years several methods of controlling electric model trains have developed The first and simplest method was the use a simple variable transformer as introduced by Lionel in 1906 to lower the Alternating Current [AC] voltage from the wall to a lower, safer value and allow the user to control the speed of a model electric train by changing the amount of AC power applied to the track Over the past 100 years several methods of controlling electric model trains have developed. Some laptops come with a built-in AC power supply, so the laptop plugs into a wall outlet with a simple ordinary plug-in, however many have the power brick which is attached to the AC cord and this can be inconvenient if you are working in a confined space. |
AC power |
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