Red and green
Series connection
In series connection, the same current
flows through two or more users. It’s an
“unbranched circuit” because the current
runs in only one way. This means that the
amperage is the same at every point. You
can try this yourself by swapping both LEDs.
The brightness remains exactly the same.
The battery voltage of 9 V is divided
between three users. The red LED has 1.8 V,
the green LED has 2.2 V, and the resistor has
5 V. If all partial voltages are added up, we
get a total voltage of:
1.8 V + 2.2 V + 5.0 V = 9.0 V
3
Behind door number 3 you will find a green LED. Integrate them
into the circuit as shown in the picture. Then both LEDs will shine
together, the red one and the green one. And switch 1 can switch
both on and off at the same time.
A simplified circuit diagram of a series connection
