Resistivity and Ohm's Law

  • Thread starter LeakyFrog
  • Start date
  • #1
22
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Homework Statement


A block of carbon is 3cm long and has a square cross section whose sides are .5cm long. A potential difference of 8.4V maintained across its length.
a)What is the resistance of the block?
b)What is the current in this resistor?


Homework Equations


R=pL/A
where p is resistivity


The Attempt at a Solution


I'm fairly certain i can solve this problem right quick if I could understand what exactly the block looked like. The description just doesn't make sense to me. I'm not sure if you can draw pictures on this or not but a picture would be helpful if someone can make one. Thanks.
 

Answers and Replies

  • #2
11
0
From what I've read the block is a cuboid. Imagine a square that's 0.5cm by 0.5cm, now stretch that back in the third dimension by 3cm, and Bob's your uncle. A similar shape to a packet of gum.

Juicy+fruit.gif
 
  • #3
22
0
thanks dude (or dudette)! helped a bunch!
 
  • #4
11
0
No worries mate.
 

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