To calculate voltage drop in a conductor, which quantities are needed?

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Multiple Choice

To calculate voltage drop in a conductor, which quantities are needed?

Explanation:
Voltage drop along a conductor comes from Ohm’s law: V_drop = I × R. To find R for a conductor, you use the material’s resistivity along with its geometry: R = ρL/A. That means you need the current flowing through the conductor (I), the length of the wire (L), and the cross-sectional area (A). The insulation thickness or the power rating don’t determine the resistance and thus don’t directly set the voltage drop, though they can influence heating or insulation considerations separately. So the quantities needed are current, length, and cross-sectional area.

Voltage drop along a conductor comes from Ohm’s law: V_drop = I × R. To find R for a conductor, you use the material’s resistivity along with its geometry: R = ρL/A. That means you need the current flowing through the conductor (I), the length of the wire (L), and the cross-sectional area (A). The insulation thickness or the power rating don’t determine the resistance and thus don’t directly set the voltage drop, though they can influence heating or insulation considerations separately. So the quantities needed are current, length, and cross-sectional area.

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