# Simple Series Circuit: depending where the resistor is, I get different results. Explanation?

I am building a very simple Series circuit with a better (9V), two LEDs (Red, 5mm) and a resistor (220Ω). See the circuit below.

Now, when I connect it all together, here is what happens:

1) (+), LED1, LED2, Resistor, (-): only LED1 lights up (that's the example on the picture)

2) (+), Resistor, LED1, LED2, (-): both LEDs light up

3) (+), LED1, Resistor, LED2, (-): both LEDs light up

So turns out, my circuit doesn't work when the resistor is connected directly to (-).

I have been told that in such simple circuit it doesn't matter where is the resistor.

Does anyone have an explanation to this?

Thank you! :)

• David's answer is correct, but I wanted to point out that you should probably connect the red (positive) wire to the row of pins with the red line next to it. The black (negative) wire would then connect to the outside row with the blue line. Color coordination makes it easier to look at your circuit. Mar 2, 2015 at 5:27
• Make sense, thanks. Never understood why the line was blue and not black, it seems counterintuitive to me. Mar 3, 2015 at 5:28