5/16 Impedance

We talked about impedance and admittance, which can be seen as resistance in AC circuit.
The impedance Z of a circuit is the ratio of the phasor voltage V to the phasor
current I, measured in ohms ().

The table below summarizes RLC impedances and admittance. 

The picture below is the example of how we calculate the impedance of the capacitor and the alternating current going through it.

Then, we did lab.

Impedance

Pre-lab

By calculating the impedance of each cases(100ohms, 1mH, 100nF), we can find the current of each cases with 5kHz frequency.

The picture above is the basic set up for this lab.

Result:

The picture above is the graph of VR(t) (yellow) and ouput V(t) (blue), and i(t) (orange) with 100 ohms resistor and 5kHz waveform.

The picture above is the graph of VR(t) (yellow) and ouput V(t) (blue), and i(t) (orange) with 1mH inductor and 5kHz waveform.

The picture above is the graph of VR(t) (yellow) and ouput V(t) (blue), and i(t) (orange) with 100nF capacitor and 5kHz waveform.

We record all the data with different frequency but we didn't do the pre-lab of 1kHz and 10kHz.

Here is the table of all the data we get.

We can only compare the data of 5kHz

The table below is the Comparison of the current and voltage:

Summary

Today, we learned impedance, which is the resistance of AC circuit. By using impedance of the circuit and the voltage function, we can calculate the current function going through each components. Also, we learned how to determine the current function by looking at the graph. From the lab, we can see that the experimental data and the calculated data match with each other. The lab ended up to be successful.