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September 21, 2014

September 21, 2014

Posted by **John** on Monday, June 10, 2013 at 10:34am.

A. less than - i think its A?

B. equal to

C. half

D. twice

A resistor most suited to dissipating high power levels would be:

A. Thick film resistor - i think it's A?

B. Wire wound resistor

C. Carbon resistor

D. Metal film resistor - i'm worried it might be D?

- Physics (Tricky) -
**bobpursley**, Monday, June 10, 2013 at 10:43amYou are guessing, and hoping I will let you answer graze. You are wrong on both.

- Physics (Tricky) -
**John**, Monday, June 10, 2013 at 10:59ami'm stuck on these question for ages now, help!!

- Physics (Tricky) -
**Steve**, Monday, June 10, 2013 at 12:14pmThink about resistance. If electrons want to get from one end of the conductor to the other, it would naturally seem likely that making the length greater would increase the resistance, since there's more material to penetrate.

Surely if you consult your class material, or even *gasp* google, you will come to see that resistance is directly proportional to the length, and inversely proportional to the cross-section area of the conductor.

So, doubling the length doubles the resistance. Doubling the diameter cuts the resistance by a factor of 4.

In about 1 minute on google I found

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html

which explains this.

Try it for the other question, and come back with what you found if you are still stuck.

- Physics (Tricky) -
**John**, Monday, June 10, 2013 at 12:32pmThanks for all the answer, also now that you put it that way Steve, it makes a lot more sense ! thank you for your time !!

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