physique chimie college lycee



2 ACTIVITIES: bulb + resistor + battery + voltmeter




I suggest here that you experimentally discover kirchhoff's voltage law for series and parallel circuit. Instructions are displayed here. We are first asked to connect elements in series measure the voltages and find a conclusion.


1. Prepare the multimeter: Plug in the black wire to COM and the red wire to V/Ω.


series connection:

2. Connect bulb and resistor in series (don't use the shunt!).

3. Make a diagram of this construction, with the relevant letters.

4. Move the plugs to the colored dots that are identified by letters to measure.

5. Measure & note VAB, VBC, VCN, VNP, VPA.

6. Calculate VAB + VBC + VCN + VNP + VPA.

7. Write a concluding sentence.


parallel connection:

8. Connect bulb and resistor in parallel (use the shunt to complete the circuit).

9. Make a diagram of this construction, with the relevant letters.

10. Measure and note VPN, VAC and VDE.

11. Compare the results.

12. Write a concluding sentence.



Kirchhoff's Voltage Law: this law is known as follows: "The directed sum of the voltages around any closed loop is zero."Here, we are led to say:

- in series, the sum of the voltage at the terminals of a set of components is the sum of the voltages measured at the terminals of each

- in parallel, the voltage is the same everywhere.


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