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31 Oct 2021
Given information
It is given that the copper wire is 21-m long, 1.628 mm in diameter and carries a current of 12-A. It is also known that the resistivity of copper is
Step-by-step explanation
Step 1.
The Ohm’s law tells that the ratio of voltage drop (V) and the current (I) passing through a resistance (R) is ideally constant which is equal to the value of that resistance itself, i.e.,
V=IR
The resistance (R) of a resistor is related with the resistivity of it’s material (ρ), it’s length (l) and the cross-sectional area (A) as,
Where, d is the diameter of the resistor.
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