AP Physics B help - Electromagnetism

  • Thread starter fuschiso
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  • #1
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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!
 

Answers and Replies

  • #2
Galileo
Science Advisor
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What have you got so far? Any ideas on what relevant equations to use?
 
  • #3
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"Brightness" is directly related to power
 

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