Design and draw a circuit diagram
Doorbell light for the music lover. You like to wear your iPod all the time, so you might not hear the doorbell. Instead you want to see by looking at one or two bulbs whether a visitor is at the front, side, or back door of your house. You should do this with only one battery, two bulbs, and three switches. One light means "front", the other light mean "back" and both lamps mean "side".