AP Physics B help - Electromagnetism

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SUMMARY

The discussion focuses on solving a 2002 AP Physics B problem involving two lightbulbs rated at 30 W and 40 W, both at 120 V, connected in parallel and series circuits. Key calculations include determining the resistance and current for each bulb in both configurations, as well as assessing their brightness based on power dissipation. The relevant equations include Ohm's Law and the power formula, which are essential for analyzing the circuits effectively.

PREREQUISITES
  • Understanding of Ohm's Law (V = IR)
  • Knowledge of power calculations (P = IV)
  • Familiarity with series and parallel circuit configurations
  • Concept of brightness related to power dissipation
NEXT STEPS
  • Calculate the resistance of the 30 W and 40 W bulbs using the formula R = V^2 / P
  • Learn how to analyze series and parallel circuits for total resistance
  • Explore the relationship between power, current, and voltage in electrical circuits
  • Investigate how to rank components based on brightness in circuit configurations
USEFUL FOR

Students preparing for the AP Physics B exam, educators teaching electromagnetism concepts, and anyone interested in understanding circuit behavior and power calculations.

fuschiso
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Hi, I've been working on a review assignment for a while, and I"m very good at electricity, so this question has me stumped.

Specifically, the 2002 AP Physics B, #3.

Two lightbulbs, one rated 30 W at 120 V and another rated 40 W at 120 V, are arranged in two different circuits.
(a) The two bulbs are first connected in parallel to a 120 V source.
i. Determine the resistance of the bulb rated 30 W and the current in it when it is connected to this circuit.
ii. Determine "..." 40 W and "..."
(b) The bulbs are now connected in series with each other and a 120 V source.
i. Determine the resistance of the bulb rated 30 W and the current in it when it is connected to this circuit.
ii. Determine ".." rated 40 W and "..."
(c)In the spaces below, number the bulbs in each situation described, in order of their brightness.
(d) Calculate the total power dissipated by the two bulbs in each of the following cases.
i. Parallel
ii. Series

If anyone could help, I'd really appreciate it!
 
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What have you got so far? Any ideas on what relevant equations to use?
 
"Brightness" is directly related to power
 

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