# Electric current being alternated with continuous part

#### DaTario

Summary
In which scenario a current may exhibit alternated and continous character together?
Summary: In which scenario a current may exhibit alternated and continous character together?

Hi All,

I would like to know in which scenario an electric current may exhibit alternated and continous character?
Something like $$I(t) = I_0 \sin (\omega t) + I_1$$.

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#### darth boozer

A simple example is ripple on the DC output from a poorly smoothed power supply. The output is DC with AC superimposed on it. Another is the DC supply to the LNB on a satellite TV dish, which is passed on the same coaxial cable bringing the signal (which is AC) to the receiver.

#### phinds

Gold Member
A simple example is ripple on the DC output from a poorly smoothed power supply. The output is DC with AC superimposed on it. Another is the DC supply to the LNB on a satellite TV dish, which is passed on the same coaxial cable bringing the signal (which is AC) to the receiver.

#### berkeman

Mentor
I would like to know in which scenario an electric current may exhibit alternated and continous character?
Another example of a DC current with an AC component (although not sinusoidal) is the i(t) current through the inductor of a "Buck" topology DC-DC converter. The average of the triangular current waveform is the average output current of the DC-DC converter (at the output voltage which is being regulated by the converter), and the ripple current depends on the switching frequency and the value of the inductance...

#### tech99

Gold Member
Another example is an analogue TV signal, which is unidirectional and so has a DC component.

#### DaTario

Thank you all, very much!

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