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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.

    Steve
     
  2. dB

    dB Guest

    Three.
     
  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
    regards
    john
     
  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.

    Steve
     
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