Compound alternating current circuits

Explanation of question 5

A series circuit has an inductance of 1.27mH and a resistance of 3. Its impedance, when connected to a 15V, 500Hz supply, will be approximately

  1. 25
  2. 5
  3. 4
  4. 3

The answer is :- 2

First we must calculate inductive reactance XL 

= 4approximately

Now we can calculate the impedance Z

=  5

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