Turn on thread page Beta
    • Thread Starter
    Offline

    1
    ReputationRep:
    hi i have done an experiment about how the diameter (and therefore area) of a 60 cm piece of nichrome wire affects it's resistance. i used 5 different diameters - 0.315,0.376,0.457,0.559 and 0.712 mm.

    I have got my results, but in the prediction i know that that if the diameter of a wire is increased, the cross sectional area of wire is also increased. This will cause the resistance to decrease, because the electrons have more room in which to flow. I also believe that the larger the area of wire, the lower the resistance.

    but i really need to link this back to ohms law, and am finding this bit tricky. please can someone help?

    thankyou

    anyone know what kind of graph to expect if i am plotting

    a.) diameter - resistance
    b.) area - resistance
    Offline

    14
    ReputationRep:
    surely it's not hard to prove that if larger diameter gives a lower resistance then larger area gives lower resistance.

    Since the area is the diameter squared times pi, it will be a curve.
    Offline

    2
    ReputationRep:
    You may wish to use the relationship that the resistance of a uniform wire is:

    R = (resistivity * length)/cross-sectional area
 
 
 
Poll
Do you think parents should charge rent?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.