2209-T North Seaman Ave. So. El Monte, CA 91733 TOLL FREE 800-821-4291 Phone: 323-686-2220 TOLL FREE FAX 888-WIREASY E-Mail: bobwire@bobmartinco.com

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RESISTANCE WIRE

Fundamental physical laws apply to design of electrical resistance heating elements used in either alternating (AC) or direct (DC) current. Current in amperes (I) is equal to voltage (E) divided by resistance In ohms (R). More simply stated:

             E

         I = -            Where I = amperes

             R                  E = volts

                                R = ohms

                          E

Similarly: E = IR and R = -         

                          I

The quantity of heat in a circuit expressed in watts (W) is equal to the voltage (E) multiplied by current in amperes (I).

More simply stated



          W = EI        Where W = watts

                              E = volts

                              I = amperes



                                 E"

Substituting above equation  I = -   into the last equation W = EI

                                 R

                              

                             W = EI 

                            

                            =E x E

                             _____

                               R



                             E = E"

                                 -

                                 R    Where W = watts

                                            E = volts

                                            I = amperes







                             W      

Similarly: W = I" R  or  R = - 

                             I"

Dia. In Ohms Per Ft. B & S Inches 77F (25C) 000 .410 .003867 00 .365 .004879 0 .325 .006154 1 .289 .007782 2 .258 .009765 3 .229 .01239 4 .204 .01562 5 .182 .01962 6 .162 .02477 7 .144 .03135 8 .128 .03967 9 .114 .05002 10 .102 .06248 11 .091 .07849 12 .081 .09907 13 .072 .1254 14 .064 .1587 15 .057 .2001 16 .051 .2499 17 .045 .321 18 .04 .4063 19 .036 .5015 20 .032 .6348 21 .0285 .8002 22 .0253 1.015 23 .0226 1.273 24 .0201 1.609 25 .0179 2.029 26 .0159 2.571

Dia. In Ohms Per Ft. B & S Inches 77F (25C) 27 .0142 3.224 28 .0126 4.094 29 .0113 5.09 30 .010 6.5 31 .0089 8.206 32 .008 10.16 33 .0071 12.89 34 .0063 16.3 35 .0056 2O.73 36 .005 26 37 .0045 32.1 38 .004 40.63 39 .0035 53.06 40 .0031 67.64 41 .00275 85.95 42 .0025 104 43 .00225 128.4 44 .002 162.5 45 .00175 212.2 46 .0015 288.9 47 .0014 331.6 48 .0013 384.6 49 .0012 451.4 50 .0011 537.2 51 .001 650 52 .0009 802.5 53 .0008 1016 54 .0007 1327

2209-T North Seaman Ave., So. El Monte, California 91733