Rate at which energy is dissipated

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SUMMARY

The discussion focuses on the energy dissipation rates of light bulbs rated at 40W, 60W, and 100W connected to a 120V/60Hz power line. It clarifies that a bulb rated for 40W does not dissipate 40J/s, highlighting the importance of understanding AC circuit principles. Participants are encouraged to explore the concepts of parallel and series resistances to solve for the current in each bulb. The conversation emphasizes the need for clarity in AC circuit calculations.

PREREQUISITES
  • Understanding of AC circuit principles
  • Knowledge of Ohm's Law
  • Familiarity with series and parallel resistance formulas
  • Basic electrical units (Watts, Volts, Amperes)
NEXT STEPS
  • Study the calculation of current in AC circuits using Ohm's Law
  • Learn about the differences between series and parallel circuits
  • Explore the concept of power factor in AC circuits
  • Investigate the behavior of resistive loads in AC systems
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Electrical engineering students, hobbyists working with AC circuits, and anyone seeking to understand the principles of energy dissipation in light bulbs.

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Light bulbs labeled 40W, 60W, and 100W are connected to a 120V/60Hz power line as shown in the figure. What is the rate at which energy is dissipated in each bulb?

http://img156.imageshack.us/img156/9584/p41qz1.png

Well ac circuits has been confusing me. I first though if a light bulb was rated for 40W it would dissipated 40J/s but this isn't the case here. I tried to solve for the current going to each but i got stuck.
 
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:frown:Please help me out. Thank you.
 
What do you know about parallel and series resistances? Can you state those formulas and show an attempt to solve them?
 

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