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AC Thevenin

0 votes

asked Dec 14, 2015 in ELECTRICAL ENGINEERING by anonymous

2 Answers

0 votes

(1)

Step 1:

Find the Thevinin's equivalent impedance.

1.Open the load resistor.

2.Open Current Sources and Short Voltage Sources.

3.Calculate the Open Circuit Resistance. This is the Thevenin's impedance (ZTH).

Redraw the circuit :

Step 2:

Observe the circuit:

is in series with .

is in series with .

image

image and image are in parallel.

image

image

image in polar form can be written as image.

Solution:

image

answered Dec 14, 2015 by Lucy Mentor
0 votes

(2)

Step 1:

Find the thevinins equivalent voltage.

1.Open the load resistor.

2.Calculate the Open Circuit Voltage. This is the Thevenin Voltage (VTH).

Use Superposition principle to calculate volatge across A and B.

Find the current through image.

Super Position Theorem :

Take one voltage source at a time and replace all other with short or internal resistance.

image

image in complex form can be written as image.

Current in the circuit is image.

image

image

Current in the circuit is image

From (1): image.

Voltage drop acoss image: image.

image

image

Step 2:

Take one voltage source at a time and replace all other with short or internal resistance.

image

image in complex form can be written as image.

Current in the circuit is image.

image


image

Current in the circuit is image

Voltage drop acoss image: image.

image

image

Step 3:

By superposition principle : 

The Voltage acoss the terminal A and B is image.

image

image

Thevinins equivalent voltage is image

Solution:

image

answered Dec 14, 2015 by Lucy Mentor

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