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RC Circuit

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asked Dec 8, 2015 in ELECTRICAL ENGINEERING by anonymous

2 Answers

0 votes

(1)

Step 1:

Observe the circuit:

The input sine voltage is image.

Compare the function with .

Here image and image.

Find the total impedance.

image and image are in parallel.

image

image.

image can be written in polar form as image.

Step 2:

in polar form can be written as .

image

image

The sine voltage can be written as image

Total impedance image.

Find the total current.

image

image

Current in sinusoidal form: image.

image

image.

Substitute corresponding values in the expression image.

image

Total current is image A.

Solution:

image can be written in polar form as image.

Total current is image A.

answered Dec 8, 2015 by cameron Mentor
edited Dec 8, 2015 by cameron
0 votes

(2)

In RC circuits with sinusoidal AC supply,

In a pure capacitance, the capacitor voltage lags the capacitor current by 90o.

Phasor diagram of the current and voltage drop:

image

answered Dec 8, 2015 by cameron Mentor
edited Dec 8, 2015 by cameron

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