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Wiring is measured in AWG (American Wire Gauge) in North America.
Sometimes it's designated with the number sign in front, such as
14 gauge or #14 wire.
The smaller gauge numbers, mean larger diameter wire. So #10 wire is thicker (and can carry more current) than #18.
From The Home Depot Wiring 1-2-3 book, here are some typical gauges used in homes:
For copper wiring: 10 gauge wire is rated for 30 amps, 12 gauge rated for 20 amps & 14 gauge wire rated for 15 amps.
A wire going to a small appliance many times is 18 gauge. Telephone wire is smaller (I think 24 gauge).
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The electricity that flows in wires is called?
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What is the international unit of resister?
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The metric system is measured in what?
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