Answer to Question 8

 

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Use the data from Question 7. The frequency is now 50 Hz.
What is the impedance of the series part of the circuit, if the resistance of the inductor is 15 ohms?

  

XL = 2 p 50 Hz 0.40 H = 126 W

 z2 = (126 W)2 + (15 W)2 = 16016 W2

 z = 127 W