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Wires are not really ideal. The voltage drop across a current-carrying wire can be important unless the resistance of the wire is quite low. Presume a 40ft extension cord is being used to provide power to an electric lawn mower. The cord carries a 11A current. The copper wire in a typical extension cord has a 1.3mm diameter.

What is the voltage drop across a 40ft length of wire at this current?

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Category:- Physics
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