User manual

7
3 More colors: red and green
Here we are going to install a green LED in series with the red
LED. Both LEDs will turn on together. You can turn both on
and off together using the switch.
Series circuit
Two or more components connected in series carry the same
current. This is a “branchless circuit” because the components
are connected along one path. This means that the current is
the same anywhere. You can easily test this by swapping both
LEDs. The brightness remains exactly the same.
The 9 V battery voltage is distributed over three components.
The red LED has a voltage drop of 1.8 V, the green 2.4 V, and
the resistor 4.8 V. You get the total voltage by adding up all
the sub-voltages: 1.8 V + 2.4 V + 4, 8V = 9.0V.