SOLUTION: Any help with the folllowing assignment question would be most appreciated. I am doing an electrical degree course which is moving too fast over the quantitative analysis section a

Question 168321: Any help with the folllowing assignment question would be most appreciated. I am doing an electrical degree course which is moving too fast over the quantitative analysis section and I am struggling to take basics for each topic.
two coils connected in parrallel
r1= 12 ohm L1= 24mH
r2= 6 ohm L2=30mH
given that f = 50Hz calculate the values of impedance for each coil Z1 and Z2 and the total impednace for two impedances in parrallel in both polar form and rectilinear form.
thanks
Kevin

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Any help with the folllowing assignment question would be most appreciated. I am doing an electrical degree course which is moving too fast over the quantitative analysis section and I am struggling to take basics for each topic.
two coils connected in parrallel
r1= 12 ohm L1= 24mH
r2= 6 ohm L2=30mH
given that f = 50Hz calculate the values of impedance for each coil Z1 and Z2 and the total impednace for two impedances in parrallel in both polar form and rectilinear form.
------------
Start with the formula for inductive reactance, which corresponds to resistance of the inductor at a specific frequency:
X = 2*pi*f*L where f is in Hz and L is in Henries
L1 = 0.024 Henry
X1 = 2*pi*50*0.024 = 7.54 ohms
r1 = 12 ohms (I assume this is the resistance of the coil) so it's in parallel with the coil.
That's 4.63 ohms (at 50 Hz)
----------------
L2 = 0.03 Henry
Same as above, X2 = 9.24 ohms
In parallel with 6 ohms gives 3.71 ohms.
---------------------
In parallel, their reactance at 50 Hz is 2.06 ohms.
I don't see anything to be plotted in rectilinear or polar form, it's just a number of ohms.
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