Voltage Drop in AWG16 cable

Discussion in 'General Electronics Chat' started by helena2390, Feb 13, 2013.

  1. helena2390

    Thread Starter New Member

    Feb 13, 2013
    1
    0
    Hello guys,
    I need to calculate the voltage drop across a wire conductor AWG 16. I have a 24VDC, 2.5A power supply and need to find out how many devices I can power for 100feet distance. Each device is 7VA. What formula to I use?
     
  2. #12

    Expert

    Nov 30, 2010
    16,346
    6,833
    248.9 feet per ohm
    200 ft round trip = .8035 ohms
    7VA/24V = .2917A each
    10% loss of voltage = 2.4V
    .2917A x .8035 ohms = .2387 volt loss per item
    2.4V/.2387 = 10 items.
    2.5A x 24V = 60 VA
    60/7 = 8.57 items.

    Limit = 8 items.
    The wire is big enough. The limit is in the power supply.
     
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