When the plumber arrived to install our new garbage disposal, he couldn\'t figur

Question

When the plumber arrived to install our new garbage disposal, he couldn't figure out how to wire it properly and I had to help. I want to see if you can do it. There is a pair of wires providing the power, labeled supply, a switch, and the two inputs to the disposal motor. Select the figure below that show a garbage disposal connected so the disposal will run when the switch is on and will not run when the switch is off. Multiple-Choice Homework Problem 7.8 A copper wire of length l and cross-sectional area .A has resistance R. If the cross-sectional area is doubled while the length remains l. what is the new resistance in terms of the original resistance R?

Explanation / Answer

given,

length = l

area = A

resistance = R

R = k * l / A

so id area is doubles the resistance will be R / 2

new resistance = R / 2

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