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different current ratings

Discussion in 'General Electronics Discussion' started by Sykes93, Oct 15, 2012.

  1. Sykes93

    Sykes93

    2
    0
    Oct 15, 2012
    ok, so i need to control the flow rate coming out of a water pump, to do this i decided to use a variac, my question is, if the pump is rated at 0.7A, can i use a 2.5A variac with it? (it will go in the order, power supply, variac, water pump) I thought i could because its the pump that draws the current, but im not sure and i need to know quickly.
     
  2. shrtrnd

    shrtrnd

    3,676
    454
    Jan 15, 2010
    Yes.
    There'll be a cross-over point when the voltage/current is enough to drive the pump.
    The pump will only draw the .7A, even though your vaiac is capable of 2.5A.
     
  3. Sykes93

    Sykes93

    2
    0
    Oct 15, 2012
    yay, youre a star, thanks for the quick reply
     
  4. duke37

    duke37

    5,256
    726
    Jan 9, 2011
    The order must be mains, Variac, power supply, water pump.
    Presumably the power supply is a simple one without voltage regulation and the motor is run on DC.
     
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