1. The problem statement, all variables and given/known data In the circuit shown in the figure, what will happen to the brightness of bulb A and bulb B when the wiper moves from point X to point Y? 2. Relevant equations 3. The attempt at a solution When the wiper moves towards Y we get smaller resistance, hence the current intensity rises, so the brightness of A increases. I think the brightness of B will increase too, as the current passing in its branch will increase. I am not sure about my answer, what's your opinion?