Series DC Circuits Q1

Discussion in 'Homework Help' started by freeman3, Jul 30, 2013.

  1. freeman3

    Thread Starter New Member

    Jul 23, 2013
    7
    0
    Hello,

    I'm trying to understand the follow-up question to the first question on this.

    http://www.allaboutcircuits.com/worksheets/dc_s.html

    Unfortunately, it's hopelessly vague to those of us learning this by ourselves.

    Can anyone help me understand what the author is trying to get at here in loads vs sources? I don't believe these two terms were introduced in this chapter.

    Thank you!
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,090
    3,027
    I don't know if it helps, but a source is a component in which the voltage goes UP as the current passes through it whereas voltage DROPS with flow across a load. So a source is like a pump that increases water pressure as the water passes through, whereas a load is like a spray nozzle. High voltage (pressure) is needed to push the current through the load resistance.

    Water is a very handy analogy for voltage (pressure), current (flow rate) and resistance (pressure drop). But it can be very confusing for more complex topics (inductance, for instance) and is no longer used in schools because it can be more confusing than it is worth.
     
    Metalmann and freeman3 like this.
  3. freeman3

    Thread Starter New Member

    Jul 23, 2013
    7
    0

    That helps alot actually. It makes sense now that their definitions would change depending on the polarity of the measurement.
     
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