E28. According to a safety code, the maximum allowable current for a 14 gauge copper wire (diameter, 1.628 mm) is 15 A, and it is 5 A for an 18 gauge wire (diameter 1.024 mm). What would be the potential difference between the ends of a 10m length of each type of wire for maximum current? ∆V14 = 1.23 V ; ∆V18 = 1.03 V Please show steps and formulas for my own understanding.

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.