PD between 2 points

  • Thread starter mujadeo
  • Start date
  • #1
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Homework Statement


a current of 2A is flowing from a to b.
what is the potential difference between the points?

______a______3ohm_____-20V+_____1ohm_______+6V-________b_____


hopefully my diagram makes sense.


Homework Equations


this is a really simple question and i cant answer it because im not understanding the whole concept.
Does current (or anything) stay constant in a cicuit??
do i follow the current round/thru circuit and do calcs along the way?
so voltage after 3ohm-R = IR = 6V
so 6V into 20V battery. now im stuck. it goes into neg term first so is that -20V?? please help somene! thanks


The Attempt at a Solution

 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
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If you assume a battery of EMF E volt is connected across the a and b such that a end is +ve and b end is -ve. Apply loop law, and find E. If you get E +ve, signs of a and b correct. If you get E -ve, reverse the signs of a and b.
 

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