Question

A 15 ohm resistor is made from a copper wire of mass 14.2 grams. What is the wire's diameter and length?
bobpursley
resistance=resisitiveity*length/area

mass=density*length*area
area=mass/density*length

resistance=resistivity*length/(mass/density8lengty)

resistance=resititivey*length^2*density/mass

solve for length, then go back and solve for area. Yes, you have to look up resisitivey and density of copper.

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