How do I work this out? Physics?

A 10-gauge copper wire (diameter = 2.588 mm, ρ = 1.7 × 10–8 Ω · m) has a total resistance of 0.32 Ω. How long is the wire?How do I work this out? Physics?
R=p.L/A


resistance is equal to product of resistivity and length divided by the area of the conductor.


so then: R.A=p.L ............ok??!!


so then L= R.A/p - that will give the value you need .





the first equation above is what you need to do the calcs.


gmcn.How do I work this out? Physics?
http://espanol.weather.com/weather/today…





(for the Spain weather question)
Use the formula R = (p*l)/a and plug in you values. That gives you l = (2.588*.32)/(1.7*10^-8)