38 



IMPEDANCE. 



Readings should be tabulated as follows : 

 DETERMINATION OF DEPENDENCE OF IMPEDANCE ON 

 RESISTANCE. 



Description of coil used 



Resistance of coil r = . .ohm 



The last column is the sum of the non-inductive resistance R and the resistance 

 of the coil. 



The results should then be shown graphically by drawing 

 a curve with values of R l + r plotted horizontally, and corre- 

 sponding values of impedance plotted vertically. 



15 3 



14 



13 



12 



o 



1 



10 11 12 13 



2345678 



Ohms. Non-inductive. 

 FIG. 17. CURVE SHOWING DKPENDENCE OF IMPEDANCE UPON RESISTANCE. 



