The instructions for an electric lawn mower suggest that a 20-gauge extension cord can be used for distance up to 35 meters, but a thicker 16-gauge cord should be used for longer distances, to keep the resistance of the wire as small as possible. The cross- sectional area of a 20-gauge wire is 5.2 X 107 m², while that of 16-gaugewire is 13 X 10-7 m². Determine the resistance of (a) 35m of 20-gaugecopper wire and (b) 75m of 16- gauge copper wire.
The instructions for an electric lawn mower suggest that a 20-gauge extension cord can be used for distance up to 35 meters, but a thicker 16-gauge cord should be used for longer distances, to keep the resistance of the wire as small as possible. The cross- sectional area of a 20-gauge wire is 5.2 X 107 m², while that of 16-gaugewire is 13 X 10-7 m². Determine the resistance of (a) 35m of 20-gaugecopper wire and (b) 75m of 16- gauge copper wire.
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Transcribed Image Text:5. The instructions for an electric lawn mower suggest that a 20-gauge extension cord can
be used for distance up to 35 meters, but a thicker 16-gauge cord should be used for
longer distances, to keep the resistance of the wire as small as possible. The cross-
sectional area of a 20-gauge wire is 5.2 X 107 m², while that of 16-gaugewire is 13 x 10-7
m². Determine the resistance of (a) 35m of 20-gaugecopper wire and (b) 75m of 16-
gauge copper wire.
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