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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the formula for calculating power factor?
π‘ Hint: Think about the phase relationship between current and voltage.
Question 2
Easy
What happens to power factor in a purely resistive circuit?
π‘ Hint: Is there a phase difference in a resistive circuit?
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does a power factor of 0 indicate in a circuit?
- Maximum power consumption
- No real power consumption
- Efficient power usage
π‘ Hint: Consider what happens when currents and voltages are 90 degrees out of phase.
Question 2
True or False: At resonance, power factor is always 0.
- True
- False
π‘ Hint: Think about what resonance means in terms of power transfer.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
In an LCR series circuit with R = 50 Ξ©, L = 200 mH, and C = 100 ΞΌF, find the resonant frequency and the average power for a supplied RMS voltage of 240V.
π‘ Hint: First, solve for the reactances, then adjust for resonance.
Question 2
Calculate the power factor and average power for an AC circuit where the voltage is 400 V RMS, current is 12 A RMS, and the phase angle is 30 degrees.
π‘ Hint: Use trigonometric identities to assist in determining the power factor.
Challenge and get performance evaluation