Current surges first one way, then the other through the toaster heating filament, changing direction 120 times per second.
Clockwise current is positive, counter-clockwise is negative.
I rms V rms . Two pipes in parallel can be replaced by one. The single pipe will have less resistance than the pipe with the least resistance. Light Bulbs in Parallel Light bulbs connected in parallel. As temperature increases, the bimetallic strip arcs to the left, settles into groove, and the spring pulls the metal bar down.