RC Circuits

Q1: What is the phase angle in the given circuit?

A 14.95°

B 36.88°

C 0°

D 90°

ANS:A - 14.95°

We have to express the whole impedance of the circuit in complex number form Z = a+b*i and then, phase = (b/a).

So lets find the impedance:

Z = 180 - 240i + (333 || -205i).

= 180 - 240i - (83250i/(333 - 250i)).

Now, rationalizing this we get Z = 300.033 - 399.8847i.

And (-399.8847/300.033) = -53.119.

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