# Calculations with household circuit wire The maximum recommended current in a 12-gauge (r = 1.03 mm)...

Calculations with household circuit wire The maximum recommended current in a 12-gauge (r = 1.03 mm) copper wire used in household circuits is 20A (a) What is the resistance of a 1-meter long section of that 12-gauge wire? (b) What is the potential difference across that section when the current is 20 A?

(a) The resistance will be

(b) The potential difference is

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