Friday

October 31, 2014

October 31, 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 !!

**Answer this Question**

**Related Questions**

Physics resistance question - A piece of copper wire of resistance R is cut into...

Physics!! Help!!!!! - A wire of length L and cross-sectional area A has ...

physics - if three resistances in parallel circuit are all equal, the total ...

physics - if three resistances in parallel circuit are all equal, the total ...

physics - We know how to calculate the total resistance of the cylindrical ...

Algebra II - The resistance of a wire is inversely proportional to the square of...

physics - A wire of length L m has 2 ohms resistance. It is stretched twice its...

math - The current I in an electrical conductor varies inversely as the ...

Physics - plz any one i am abit confused can you answer these questions thx 05. ...

Tj - a wire has a resistance of 10 ohms. The length of the wire is doubled, and ...