Determining the impedance in circuits with capacitors and coils

VP3.6.3.3
Determining the impedance in circuits with capacitors and coils
Determining the impedance in circuits with capacitors and coils Current and voltage on a parallel resonant circuit (P3.6.3.3)
Determining the impedance in circuits with capacitors and coils

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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 UC and UL 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 IC and IL are equal and opposed.

Components of equipment sets

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

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P3.6.3.3 Determining the impedance in circuits with capacitors and coils
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