1. The rate of transfer or absorption of energy per unit time in a system.
2. Whenever the power of a radio transmitter etc. is referred to, it shall be expressed in one of the following forms, according to the class of emission, using the arbitrary symbols indicated:peak envelope power (PX or pX);
mean power (PY or pY);
carrier power… (Read More →)

The allocation, within a system, of available electrical power, among the various functions that need to be performed.
Note: An example of a power budget in a communications satellite is the allocation of available power among various functions, such as maintaining satellite orientation, maintaining orbital control, performing signal reception, and performing signal retransmission. Synonym system budget.

1. The primary switch used to apply and remove power from equipment.
2. A circuit breaker used on ac circuits rated in excess of 1500V.

Deprecated synonym for irradiance.

With respect to an electrical and especially an electronic device, to turn off or otherwise disconnect its primary source of electric power.

A space in a building where commercial ac power, standby ac power, or both, enter the building. The PEF contains the ac service equipment and may also contain secondary ac surge protective devices. [T1.321-1995]

In alternating-current power transmission and distribution, the cosine of the phase angle between the voltage and current.
Note 1: When the load is inductive, e.g., an induction motor, the current lags the applied voltage, and the power factor is said to be a lagging power factor. When the load is capacitive, e.g., a synchronous motor or a capacitive network, the… (Read More →)

1. The switching of primary utilities to their secondary backup whenever the primary source operates outside its design parameters.
2. In telephony, a function, which, when activated in the event of a commercial power failure or a low-voltage battery condition at a subscriber location, supplies power to predesigned subscriber equipment via the central office trunk.
Note: Power-failure transfer is an… (Read More →)

Synonym antenna gain.

The difference between available signal power and the minimum signal power needed to overcome system losses and still satisfy the minimum input requirements of the receiver for a given performance level.
Note: System power margin reflects the excess signal level, present at the input of the receiver, that is available to compensate for (a) the effects of component aging in… (Read More →)