Calculate the drift velocity of the electrons  in a 12-gauge copper wire which has a diameter of 2. 5 mm carrying        an 18.0 A , given that there is one free electron per copper atom. The density of copper is 8.80x103 kg/m3.      atomic mass of copper = 63.54 g/mol; Avogadros number = 6.02 x 10 23 atoms/mol 2. Calculate the total DC resistance of a 100 meter roll of 2.0mm2 copper wire if the resistivity of copper at 200  C is 1.72 x 10-8 ohm meter

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A: 31.2 kcal is correct answer.

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Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

Path of Least Resistance

In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.