February 20, 2017

Homework Help: Physics

Posted by Bob on Monday, May 4, 2009 at 1:54pm.

(1) 45 micro coulombs of charge is passed through a wire in 35 seconds. How many electrons does this represent? What is the current in the wire?

(2) A piece of copper wire has a resistance of 5 Ohms at 20 degrees celsius. If another piece of copper wire at 0 degrees celsius is 3 times as long and has a cross sectional area that's twice as big, what will its resistance be?

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