Objective. Measure the phase relation between capacitors and inductors in an alternating current using an Oscilloscope.

CENTRO DE ENSEÑANZA TÉCNICA Y SUPERIOR

Escuela de Ingeniería

Lab 4. AC Circuits Analysis

Objective.  Measure the phase relation between capacitors and inductors in an alternating current using an Oscilloscope.

Materials:

[pic 1]

1. Electrolytic Capacitors [pic 2]
2. Inductors (Coils) [pic 3]
3. Resistance [pic 4]

For one charge:

1. Resistive, the voltage and the current are in phase.
2. In inductive and capacitive, diphase exist ( or 90°).[pic 5]

Procedure:

1. Both generators will have a frequency of. Calculate frequency in Hertz.[pic 6]
2. Peak voltage will be.[pic 7]
3. Calculate the impedance of the inductor and the capacitor.
4. To visualize the diphase between the voltage and the capacitor’s current, you should put the oscilloscope’s tips as shown in the image below, putting a serial resistance of   to represent the oscilloscope’s current. In this way, channel 1 represents voltage and channel 2 represents current.[pic 8]
5. Locate the “Cursor” button in the Oscilloscope to visualize a change in time, that will represent diphase in mS.
6. To measure currents between components, put the millimeters in series with the component as shown in the image below.

[pic 9]

1. Changing the capacitor and inductors values, determine the diphase in degrees that are presented between the capacitor’s voltage and current. Fill the table:

1. Calculate the impedance of the inductor and the capacitor changing the frequency of each component and determine again the measure’s values.

1. Represent with a graph the wave’s forms of the circuit shown before. You can take a picture of the results showed in the oscilloscope.

1. In your final report, you should include the theoretical fundaments related to the diphase that exist between voltage and current between this devices.

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