A number 14 copper wire has a diameter of 1.628 mm. Calculatethe resistance of a 34.0 m long piece of such wire.
(Use 1.72×10-8 Ωm for the resistivity of copper.)
2.809×10-1 Ohm
For safety, the National Electrical Code limits the allowableamount of current which such a wire may carry. When used in indoorwiring, the limit is 15.0 A for rubber insulated wire of that size.How much power would be dissipated in the wire of the above problemwhen carrying the maximum allowable current?
6.321×101 W
What would be the voltage between the ends of the wire in theabove problem?
4.214 V
What is the current density in the wire when it is carrying themaximum allowable current? (Current density is the current in thewire divided by the cross sectional area of the wire.)
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What is the drift velocity of the electrons when the wire iscarrying the maximum allowable current?
(The density of electrons in copper is 8.47×1028m-3.)
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