a) A 33.7 m length of copper wire at 20.0C has a radius of o.28mm. If a potentia

Question

a) A 33.7 m length of copper wire at 20.0C has a radius of o.28mm. If a potential difference of 7.0 v is applied across the length of the wire, determine the current in the wire. 3 266 Your response is within 10% of the correct alue. This may be die te ronde ! enor, or You could have a mistake in your canition. Carry out at intermediate results to at leas digit accuracy to minimice roundoff error A ) the wire is heated to 30.0ac, while the 7,0 V potential difference is martained, what is the resulting current in the wire? Your response ddlers from the correct answer by more than 1 %. Need Help? Tr

Explanation / Answer

a) resistance of wire at 20° C

R= rho*L/A= 1.7*10^-8* 33.7/[ pi*(0.28*10^-3)^2]

R= 2.327 ohm

Current, i= V/R= 7/2.327= 3.008 A

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b)

Resistance at 30°C

R= 2.327* ( 1 + 3.9*10^-3(30-20))

R= 2.418 ohm

Current through circuit,

i= V/R= 7/2.418

i= 2.895 A

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Commemt in case any doubt.. good luck

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