A 15m long copper wire has a cross-sectional radius of 3mm. (a) What is the resistance of the wire? (b) If 200mA of current flows through the wire, what is the voltage drop of the wire at 20°C? (c) What is the voltage drop per meter at 20°C

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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.