Discussion
Which size of wire has the highest current carrying capacity ?
Answer: B
The wire with the highest current carrying capacity is 4 gauge.
In the standard wire gauges the number runs the opposite way to the size: the smaller the gauge number, the thicker the wire. A thicker wire has a larger cross-section and lower resistance per metre, so it heats less and can carry more current.
Of 4, 10, 12 and 18 gauge, 4 is the thickest and 18 the thinnest, so 18 gauge carries the least current and 10 and 12 gauge sit in between.
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