Add the LED

Insert an LED on the breadboard as indicated on the schematic. Don't forget to put the long leg of the LED towards the (+) of the circuit (red wire connecting the battery to the breadboard).

But don't connect the LED back to the battery (-) just yet! You would blow up the LED in just a few seconds. There is too much current going through the circuit for the LED. To solve that issue - and understand how it all works together - let's introduce another component: the resistor!