Circuit Continuity Checker
We Ye now going to look at how we test electronic circuits, One of the simplest things we might want to find our is whether or not a part of a circuit is open or closed (remember those terms from Project Telegraph in Electric power Section).
This Project is simple but it does the job. You can probably figure out how to use this Project just by looking at the schematic.
Turn the power ON and place the two long wires at opposite ends of the circuit part you want to test, If the electricity is able to flow through the circuit, the Lamp will light. If it does not light at all, you'll know the circuit portion is open.
This is an especially handy circuit for testing items such as insulated wire or cable. You canst tell if a plastic-covered wire can conduct electricity by looking at it, you have to use a tester like this. T
his device is also helpful in trying to find out if there's an electric current flowing along a path where it's not supposed to. (This is called a short circuit.) You can use this circuit to check the conductivity of a wide variety of objects around your home.
But don't use this Project to check the conductivity of anything connected to a wall electric outlet (such as an electric range or record player). In fact, don't use this circuit to check anything connected to a source of electricity (even if it's only batteries).
If you try to check something that has an electric current flowing in it, you could burn out the Lamp.