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AC Circuit Power

0 votes

asked Dec 9, 2015 in ELECTRICAL ENGINEERING by anonymous

5 Answers

0 votes

(a)

Step 1:

Observe the circuit:

and are in series.

is in parallel .

image

Step 2:

Find the voltage source power.

image

image

image

Voltage source power is the real part of the image.

Voltage source power image

Solution:

Voltage source power image

answered Dec 9, 2015 by Lucy Mentor
0 votes

(b)

Find the power across the resistor image.

Voltage in a parallel network is same, hence find the current flowing through image.

image

image

Find the power dissipated across the resistor image.

image

image

image

image

Power dissipated across the resistor image is image

answered Dec 9, 2015 by Lucy Mentor
edited Dec 9, 2015 by Lucy
0 votes

(c)

Find the power across the resistor image.

Voltage in a parallel network is same.

Find the power dissipated across the resistor image.

image

image

image

Power dissipated across the resistor image is image

answered Dec 9, 2015 by Lucy Mentor
0 votes

(d)

From (a):

Find the total current.

image

image

image

image in polar form can be written as image

Total current is image.

answered Dec 9, 2015 by Lucy Mentor
edited Dec 9, 2015 by Lucy
0 votes

(e)

From (b):

Current across the resistor image is image

From (d):

Total current is image.

Find the current across the resistor image.

Observe the figure:

image

image in polar form can be written as image

Current across the resistor image is image.

answered Dec 9, 2015 by Lucy Mentor

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