Some basic Electronics


You should have a basic idea of the different components in your bag and what they do. If you’re still looking for information use these websites:

Now you’re ready to start building your own circuits …

Breadboard Connections

You need to know how a breadboard works. This image shows how all the holes in the breadboard are connected. Breadboards provide an easy way to build circuits without having to do any soldering.


Basic Circuit

This is an example of a basic electronic circuit. On the left you see the power source, the long line represents + and the short line represents -. If you would connect the + directly to the – you would create a short-circuit and could damage your power source. The resistor “resists” current flowing through the circuit and prevents a short-circuit. More resistance = less current.

In any circuit you need to have an uninterrupted path from + to – before any current can flow.

LED Circuit


Here is an example of a circuit with an LED. You can see a power source, an LED and a resistor in the circuit. You can also see that there is an uninterrupted path for the current to flow, the current will pass through the LED and through the resistor. You should be able to build this circuit using a breadboard and components.



  • What will happen if you change the value of the resistor?
  • What will happen if you put the resistor in front of the LED?
  • What will happen if you turn around your LED (switch + and -)?
  • What will happen if you add a second LED after the first one?