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    Rainbowinthesky's Avatar
    Rainbowinthesky Posts: 1, Reputation: 1
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    #1

    Nov 19, 2013, 12:15 AM
    Why does your housing society pump consume less and less current after running.
    Why does your housing society pump consume less and less current after running - Its rating is 9 Amp it starts with 6.4 reducing slowly to 5 Amp?
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Nov 19, 2013, 06:11 AM
    All electric motors have a inrush of current at startup in excess of what it takes to continue running. There are a number of reasons for this some of them requiring an in depth knowledge of physics and electricity.

    But a simplified answer is it takes more energy to get an object started into motion from being at rest... than to maintain that motion once started.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    Nov 19, 2013, 07:42 AM
    Smoothys simple explanation is also a simple explanation of Newton's First Law. Because of inertia it takes more energy to get started than to keep running.
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #4

    Nov 19, 2013, 08:15 AM
    Agree with the previous explanations plus the fact that the start windings of the motor as well as the run windings are energized during start up. After reaching approximately 75% of run speed, the start windings are de-energised.
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