1. The problem statement, all variables and given/known data All bulbs are identical, (no information given on resistance so assuming all the same) All the switches are closed and then S1 is opened, Does bulb 6 get brighter, dimmer or stay the same? Does bulb 4 get brighter, dimmer or stay the same? Explain briefly why. 2. Relevant equations None assuming resistance is equal 3. The attempt at a solution Seeing as there is no info on resistance I am assuming that bulb 6 would actually get brighter as it is the path of least resistance but I am not entirely sure and would like some clarification. Would bulb 4 stay the same? my reasoning is that the circuit splits before bulb 4 so it wouldn't make any difference. Or maybe it would dim as some of the current that was going through bulbs 2 and 3 is no longer splitting and heading towards 4?