Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

Let’s change the circuit again and add a switch. A switch turns ... with your friends and draw diagrams to match what you build. It looks like our battery has run out of energy.

We can see how circuits work, and represent them with some simple diagrams ... components in the circuit, to be powered by the cell. Like a motor. Or you can even put in a switch that can ...

Go to the main electrical panel and flip off the circuit breaker that’s feeding power to the light switch. (Or, unscrew the fuse if your home has a fuse box.) Next, remove the cover plate from ...