Day 19

Impedance

In this lab assignment, we measure impedes of resistors, capacitors, and inductors. The measured values will be compared with our expectations based on analyses. 

In the pre-lab, we calculate the impedance for RR, RL,and RC circuit.

The RR circuit is set up.

This picture is about the RR circuit with 1KHz. Vt= 1.354 V, I=13.2 mA. 

This picture is about the RR circuit with 5KHz. Vt= 1.354 V, I=13.2 mA.  

 This picture is about the RR circuit with 10KHz. Vt= 1.354 V, I=13.2 mA. 

The picture about resistor impedance = 47+ R, and the experiment value of resistors are 46.6Ohm and 99.9Ohm. so the experiment impedance is 146.5, its percent is 0.34%. 

The RC circuit is set up.

 This picture is about the RC circuit with 1KHz. Vt= 0.2652 V, I=40.05 mA.

  This picture is about the RC circuit with 5KHz. Vt= 1.0584 V, I=34.2 mA.

  This picture is about the RC circuit with 10KHz. Vt= 1.546 V, I=25.4 mA.

 A 2V sine wave  power is applied into a RL circuit.

 The RL circuit is set up

 This picture is about the RL circuit with 1KHz. Vt= 1.999 V, I=1.05 mA.

 This picture is about the RL circuit with 1KHz. Vt= 1.9774 V, I=4.955 mA.

  

This picture is about the RL circuit with 10KHz. Vt= 1.924 V, I=9.475 mA. 

When  different frequencies of 1kHz, 5kHz, and 10 kHz frequencies. In the capacitor circuit the current leads voltage by 90°

Summary:

Today, we learn that a resistor AC circuit has no phase change between the voltage and current.

And at the same time, the voltage lead the current by 90 degree with inductor. The current lead the voltage by 90 degree with capacitor.