Physics Resistors Cube Problem

• eagle

  23 Feb 10, 08:34

  I will normally use this to challenge my H2 Physics students to stretch their thoughts processes. Posting here to share :)

  Consider the resistor cube below:

  

   

  Find the resistance between
  (i) A and H
  (ii) A and F
  (iii) A and B

   

   

  
  

• eagle

  27 Feb 10, 10:29

  The key to solving this question easily is to understand the concept of potential, and sketch out the circuit with that understanding before solving it in a simple way.

  Remember that potential is not the same as potential difference; potential difference is calculated as the difference in the potentials. 10V p.d. can be the difference between 10 and 0, or 11 and 1, or 12 and 2, or 8 and -2, etc etc...

   

  Of course, for part (i), we can use Power to solve it as well.