**Series Circuiting of Resistors**

**General**

If resistors or quite generally loads are circuited in series, the same current flows through them. The size of the current is determined by the ap plied voltage U and the total resistance Rtot:

*Rtot = R1+R2+R3*

A partial voltage is applied to each individual resistor. The sum of all the partial voltages gives the total resistance.

*Utot= UR1+UR2+UR3*

**Experiment**

By measuring current and voltage, prove that the current is the same at every point in a series circuit and that the sum of the partial voltages gives the total voltage.

Ā

**Experiment procedure**

-Set up the experiment according to circuit (figure 2) and apply 10 V DC to the input.

-Break the connections between A-B, C-D, E-F and G-H one after another and measure the current through the series circuit between the test points.

-Then measure the partial voltages at test points B-C, D-E, F-G as well as the total voltage at test point B-G.

-Break the connections between point A and power supply and measure the resistance between point A and H.

**Table 1**

**Question 1:** How do the partial voltages behave in relation to the corresponding resistance value?

**Question 2:** Are the measured resistivity directly different from the calculated according to the formulas?

**Question 3:** How to determine the resistance between points A and B as indirect measurements?

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