Can AC Currents Be Added in a DC Circuit?

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In DC circuit currents can be added if they meet at some point, but in AC current in resistor, inductor and capacitor differs, becase they are out of phase, can they be added?
 
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You can add the complex numbers that represent current and phase.
 

Thread 'Reflections at the source point of a transmission line'

I was using the Smith chart to determine the input impedance of a transmission line that has a reflection from the load. One can do this if one knows the characteristic impedance Zo, the degree of mismatch of the load ZL and the length of the transmission line in wavelengths. However, my question is: Consider the input impedance of a wave which appears back at the source after reflection from the load and has traveled for some fraction of a wavelength. The impedance of this wave as it...
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