Lesson: Impedance and Power of Alternating-Current CircuitsPhysics
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.
Sample Question Videos
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?
A 20 Ω resistor, 50 µF capacitor, and 30 mH inductor are connected in series with an ac source of amplitude 10 V and frequency 125 Hz.
What is the impedance of the circuit?
What is the amplitude of the current in the circuit?
What is the phase constant of the current?
How much energy is dissipated by the resistor in 2.5 s?
An alternating current generator is connected to a device whose internal circuits are not known. We only know the current and voltage outside the device, as shown in the diagram. What is the power dissipated by the circuit?