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Determining the impedance in circuits with capacitors and coils

Determining the impedance in circuits with capacitors and coils

VP3.6.3.3

Current and voltage on a parallel resonant circuit (P3.6.3.3)

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Description

The experiment P3.6.3.3 examines the oscillator circuit as the series and parallel connection of capacitance and inductance. The total impedance of the series circuit

disappears at the resonance frequency

i.e. at a given current I the total voltage U at the capacitor and the coil is zero, because the individual voltages U_C and U_L are equal and opposite. For parallel connection, we can say

At the resonance frequency, the impedance of this circuit is infinitely great; in other words, at a given voltage U the total current I in the supply line is zero, as the two individual currents I_C and I_L are equal and opposed.

Components of equipment sets

1	57681 4	Plug-in board safety socket, 20/10
1	57720 4	Resistor, 10 Ω, STE 2/19
1	57732 4	Resistor 100 Ohm, STE 2/19
1	57815 4	Capacitor, 1 µF, bipol., STE 2/19
1	57816 4	Capacitor, 4.7 µF, bipol., STE 2/19
1	59083 4	Coil 500 turns STE 2/50
1	59084 8	Coil 1000 turns STE 2/50
1	522621 4	Function generator S 12
1	575302	Oscilloscope 30 MHz, digital, PT1265
2	57524 4	Screened cable, BNC/4 mm Plug
1	500641 8	Safety experiment cable, 100 cm, red
1	500642 4	Safety experiment cable, 100 cm, blue

Experiment Instructions

PDF (Experiment description)

P3.6.3.3 Determining the impedance in circuits with capacitors and coils

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Determining the impedance in circuits with capacitors and coils

Description

Components of equipment sets

Experiment Instructions

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