2 different questions that I'm using to test my understanding of the physics concepts rather than the math:
How does the brightness of bulb A compare to that of bulb C?
After D is added how does the brightness of bulb A change?
Does the brightness of B change?
Does the current through the battery change?
What is the current through 1, 2, 3?
What is the current through C, D, E?
Less math more conceptual, so no equations to use (plus we havent learned any equations for circuits yet)
The Attempt at a Solution
so for 1a I said that bulb A is brighter than bulb B/C because B & C are in parallel with each other, it increases the current through bulb A.
1b I said bulb A becomes brighter, because the addition of bulb D increases the current throughout the whole circuit. Bulb B does not change brightness because the current through its portion does not change, and the current through the battery increases since the overall current through the whole circuit increased.
For 2 I said the current through 1 is 60, equal to the bulb. For 2 I said it's 30, since 30 goes through B, which means 30 will go through C, so 30 reaches the battery equal to the bulb. For 3 I said it's 120, because D and E both have 60 mA since they're in parallel, so the total is 120.
Does my reasoning of these concepts seem good or am I off on something?