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In this lesson, we will learn how to calculate the impedance of RLC alternating current circuits and how phase angle depends on impedance and frequency.

Q1:

The figure shows an RLC circuit.

What is the total impedance of the circuit?

What is the phase angle between the current and the emf in the circuit?

Q2:

An RLC series circuit consists of a 50- ฮฉ resistor, a 200- ๐ F capacitor, and a 120-mH inductor whose coil has a resistance of 20 ฮฉ. The source for the circuit has an rms emf of 240 V at a frequency of 60 Hz.

Calculate the rms voltage across the resistor.

Calculate the rms voltage across the capacitor.

Calculate the rms voltage across the inductor.

Q3:

An alternating current generator is connected to a device whose internal circuits are not known. We only know current and voltage outside the device, as shown in the diagram. What is the power dissipated by the circuit?

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