Engineering Circuits (Power and Complex Power) Help

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SUMMARY

This discussion focuses on solving problems related to circuits, specifically power and complex power calculations. The key equations mentioned include S = P + Q, where S represents complex power, P represents real power, and Q represents reactive power. Participants emphasize the importance of understanding impedance, represented as Z = R + jX, and the calculation of current using I = V/Z. Additionally, visualizing the power triangle is recommended to clarify the relationships between these variables.

PREREQUISITES
  • Understanding of complex numbers and their representation in electrical engineering.
  • Familiarity with Ohm's Law and basic circuit analysis.
  • Knowledge of power calculations in AC circuits, including real and reactive power.
  • Ability to convert between polar and Cartesian forms of complex numbers.
NEXT STEPS
  • Study the concept of impedance in AC circuits, focusing on Z = R + jX.
  • Learn how to calculate current using I = V/Z in various circuit configurations.
  • Explore the power triangle and its significance in understanding power relationships in AC circuits.
  • Practice converting complex numbers between polar and Cartesian forms to enhance problem-solving skills.
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in analyzing AC circuit performance and power calculations.

funk21
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Homework Statement


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Homework Equations


The Attempt at a Solution



I am just lost on these two problems. What I think on the first one is that I have to convert the voltage but from there I am lost. I am guessing I also have to figure the current.

For the second problem, I know that S = P + Q. I am just lost on the other ones.

Thanks for the help.
 
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Well you should know that Z=R+jX and I=V/Z, so find that and convert that into polar/Cartesian form.
 
For the second part, try drawing out a 'power triangle' and thinking about what each of the three sides represent.
 

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