A circuit is displayed. The circuit is a rectangle with a line through the middle. There is a lit lightbulb on top, an open switch on the middle line, and a resistor on the bottom-most line. There is a battery on the left side between the middle and bottom-most horizontal lines.
The switch closes and the lightbulb turns off. The switch opens and the lightbulb turns back on. The switch closes and the lightbulb turns off. The switch opens and the lightbulb turns back on.