Lab Report Day Nineteen - Impedence

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 a RR circuit, RL circuit, and RC circuit.

 

This is the set up of our RR circuit. 

 

This is the RR circuit at 1k frequency. Vt= 1.354 V, I=13.2 mA. 

 

This is the RR circuit at 5k frequency. Vt= 1.354 V, I=13.2 mA. 

 

This is the RR circuit at 10k frequency. Vt= 1.354 V, I=13.2 mA. 

 

We determined the resistor impedance = 47 + R 

the real resistor values came out 46.6 ohm and 99.9 ohm, and therefore the experimental impedance for resistors = 146.5 ohm. 

We get our percent difference to be 0.34%. 

 

 

This is the set up for the RL circuit. 

 

This is the RL circuit at 1k frequency. Vt= 0.2652 V, I=40.05 mA. 

 

This is the RL circuit at 5k frequency. Vt= 1.0584 V, I=34.2 mA. 

 

This is the RL circuit at 10k frequency. Vt= 1.546 V, I =25.4 mA. 

 

The circuit is supplied with a 2V sine wave with different frequencies of 1kHz, 5kHz, and 10 kHz frequencies. In the inductor circuit the voltage leads the current by 90°. 

 

This is a RC circuit we build.

This is the RC circuit at 1k frequency. Vt= 1.999 V, I =1.05 mA. 

 

This is the RC circuit at 5k frequency. Vt= 1.9774 V, I =4.955 mA. 

 

 

This is the RC circuit at 10k frequency. Vt= 1.924 V, I =9.475 mA. 

 

The circuit is supplied with a 2V sine wave with different frequencies of 1kHz, 5kHz, and 10 kHz frequencies. In the capacitor circuit the current leads voltage by 90°

 

Summary:

Today, we analyze AC circuits. We find that a resistor AC circuit has no phase change between the voltage and current. The voltage leads the current by 90° in a circuit with an inductor and the current leads the voltage by 90° in a circuit with a capacitor. We learn that circuit elements can be represented as impedance.