A light switch is the simplest of electrical devices. Flip the switch, electricity flows. Flip it again, electricity stops. Lights on, lights off. That’s great for a small room with one entrance.

Did you know slips, trips and falls are some of the most common home safety hazards? Say goodbye to stubbed toes and bruised shins. Add a four-way switch and walk with confidence.

Q:I have a three-way switch that controls the light at the top of the stairs. The switch at the bottom doesn't always work like it is supposed to. Sometimes when I turn it off, the switch at the top ...