Q: Does an electric lightbulb flicker at...

Q: Does an electric lightbulb flicker at the 60-cycles-per-second frequency of alternating current?

A: Yes and no. A fluorescent bulb does flicker at 60 cycles per second. That flickering is too fast for the eye to see. If you see a fluorescent light flickering, that usually means there is something wrong with the lightbulb.

An incandescent bulb, however, does not. The heated filament remains hot during those milliseconds when there is no current passing through it, so it emits a steady glow.