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Wire Gauge and Resistance problem

I am using 18 gauge nicrome wire having ohm of 17.3 , 220 volt. I want to use 10 gauge wire how to decide the length?

Padmanava asked

Answer:

18 gauge corresponds to a diameter of 1.22 mm

Therefore radius r1= 1.22/2=0.61 mm=0.00061m

10 gauge means diameter is 3.25 mm

Radius r2 = 3.25/2=1.625mm=0.001625m

Sine the resistance needs to be the same, we can use the formula


Which gives

As resistivity is same.

Substitute the values and you will get the answer.

Screw Gauge

Neeraja asks: “in screw guage the nut is a fixed one or not?”

Answer: Please refer to the following links for your answer.

  1. http://www.brighthub.com/engineering/mechanical/articles/65356.aspx?image=67475
  2. http://www.brighthub.com/engineering/mechanical/articles/65356.aspx
  3. http://www.tutorvista.com/physics/screw-gauge-measurement

 

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