Roll Your Own Power-Transformers!

Jan Rowland

11/97

Roll Your Own Power-Transformers!

formula for computing the diameter of bare copper wire in decimal inches

If it's been a long time since you've calculated such a formula, below are the steps to take using Windows 95 Calculator in Scientific mode, which you can select from the View menu.

Enter 92 then press the x^y key.

Enter 39 then press the 1/x key

Press the = key. (you should see the answer 1.122932196532 )

Press the x^y key

Press the ( key.

Type the number 36

Press the - key

Type your wire awg number (for this example I chose 10 for the AWG)

Press the ) key.

Press the = key. (you should see the answer 20.37942305522)

Press the * key then type in .005

Press the = key and you should have, in this example, the wire diameter of 10AWG wire in inches, which is 0.1018971152761

Convert this to mils by moving the decimal point to the right 3 spaces, giving 101.8971152761

Rounding to one digit past the decimal point leaves 101.9 (which agrees with the table)

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