Is it a "transfer switch"?

[Nater]

Hello! I'm building a game that uses small wires to connect & power series' of lights, bells, and whistles (currently using a 9 volt battery). I need to know how to make the buzzer go off when the player diconnects the wrong wire. Kinda like how a transfer switch (in the circuit box of a house) will divert to the generator when the power goes out. In other words, how can I make a light come on by unplugging it?

 

[BobK]

Easiest way, if you do not know much about electronics, is to use a normally closed relay. Powering the relay turns the light off. Removing power to the relay turns the light on.

You can also do the same with a transistor for a small bulb or an LED.

Bob

 

[Nater]

A relay is exactly what I was looking for. Thank you Bob!