difference between power consumption and power dissipation

Discussion in 'General Electronics Chat' started by aniket07, Jan 20, 2011.

  1. aniket07

    Thread Starter New Member

    Jan 8, 2011
    what is the difference between power consumption and power dissipation in general???
  2. someonesdad

    Senior Member

    Jul 7, 2009
    There's probably no agreed-upon formal definitions. Informally, power consumption would mean the total power consumption of a device. Power dissipation usually connotes that power that is consumed by things not related to the desired task at hand.

    Example: the current in a motor's winding is used to generate a magnetic field. This requires a total power. Some of that power is dissipated in the conductor's resistance as heat, producing no useful work.
  3. Adjuster

    Well-Known Member

    Dec 26, 2010
    Power dissipation most often indicates the amount of power wasted as heat by a given device. That is normally what is meant when an electronic device is given a maximum power dissipation rating. Other forms of useless dissipation are possible, but not usually significant.

    The (total) power consumed by the device may be much greater than its own dissipation, for instance a voltage converter operating at 90% efficiency might consume 10W, deliver 9W output, and dissipate 1W of heat.