Homework Help: College Physics

Posted by Lanise on Saturday, February 6, 2010 at 11:31pm.

Two copper wires have equal cross-sectional areas and lengths of 2.4m and 1.3m, respectively.
What is the ratio of the current in the shorter wire to that in the longer one if they are connected to the same power supply?
I1.3/I2.4 =

College Physics - drwls, Saturday, February 6, 2010 at 11:46pm
Resistance of wire is proportional to length in this case (same area for both wires).

For equal voltages on both wires, current is inversely proportional to resistance. Current is therefore also inversely proportional to length.

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