Today was Experiment #6: Very Simple Switching.
The rudiments of switches
The switches that were included in this kit have 3 terminals, but some switches, like the lights in your house, have 2 terminals. This is because their output is only on or off. These switches are known as single throw switches. A single-pole, single-throw switch is abbreviated SPST.
I tried making the circuit in the book but the LED wouldn’t light up because my wires would not attach to the switch.