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Power consumption of wall-wart power supply?

Discussion in 'Electronic Basics' started by Steve, Sep 3, 2004.

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  1. Steve

    Steve Guest

    I'm using a circuit that takes 300mA from a wall-wart 9VDC linear
    unregulated power supply.

    What would be an estimate of the watts it uses from the power lines (in the
    UK, so ~240VAC)?

    Many thanks.

  2. dB

    dB Guest

  3. 300 mA x 9 V = 2.7 watts coming out of the wall wart.

    Allowing for some inefficiency, maybe as much as 5 watts in.
  4. john jardine

    john jardine Guest

    Fully loaded about 6watts. Just sitting there, about 3watts
  5. Steve

    Steve Guest

    Many thanks for the replies to this thread - very simple now I realise! I
    only need a rough figure so that's great.

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