Draw current and nothing connected?

Discussion in 'Computers' started by joner8888, Sep 14, 2012.

  1. joner8888

    joner8888 Read Only Funster

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    Does a tranformer if switched on with nothing drawing current from the low current outlet stiill use power?
    I notice if i leave my laptop mains unit on but not connected to the pc, it stays cold.
    If i connect the laptop it warms up--
    so if it`s cold, does that mean it is not drawing power?
    Also the house phone charge units--if no phone plugged in ,do they still use power?
     
  2. hilldweller

    hilldweller Funster Life Member

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    Can never be zero but a well designed power supply will be negligible on you bill. The tree huggers go and multiply that next-to-nothing by a billion and then it starts to look frightening.

    You are right, heat is a great indicator, ideally they should always be cold, all that heat is wasted money to you.

    LEDs are a great example. Some you could burn yourself on, some just warm.
     
  3. scotjimland

    scotjimland Funster Life Member

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    and us Jocks .. :Laughing:
     
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