Voltage Problem

Discussion in 'General Electronics Chat' started by xiahbaby, Apr 23, 2009.

  1. xiahbaby

    Thread Starter New Member

    Feb 4, 2009
    I do not understand why 34V has to be in negative?

    And why do we have to minus Va with it in order to get the voltage across 17Ω resistance?

    Why isn't the voltage across 17Ω = -1.275V?
  2. recca02

    Senior Member

    Apr 2, 2007
    34V is not in negative, it just has a polarity that tends to send a current in a direction opposite to the direction of current assumed for circuit analysis.
    Because -1.275V is across the 34V and 17 ohm resistor pair. To get the voltage across the resistor alone you algebraically subtract the voltage source.