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Experiment 1 - Batteries in a Series Circuit

In this first experiment, you connect two AA batteries in a series circuit. The positive terminal of a battery is connected to the negative terminal of the second battery. Both batteries have a voltage of 1.5 V. What is the resulting voltage?

To find out, construct the shown circuit and measure the voltage.

Series Circuit of two AA-Batteries. ( Enlarge)

Circuit diagram of two batteries in series.

You measure a total voltage of 3 V. In a series circuit of batteries the voltages of the individual batteries add up...

Utotal = U1 + U2 = 1.5 V + 1.5 V = 3.0 V

Series Circuit

If the components are connected such that there is only one path for the current through the components, it is called a series circuit.

From Kirchhoff's Current Law (KCL) follows that the same amount of current flows through all the components.