Electrical Engineering: Ch 11 AC Circuit Analysis (18 of 34) Superposition: Example 1
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- เผยแพร่เมื่อ 7 ก.ย. 2024
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We will use the “magic” of superposition to solve I=I1+I2=? of a circuit with 2 voltage sources. (Example 1)
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Happy to hear that!
Of course Mr. Biezen, it's magic!!!!!
Thank you. (This method strangely works).
Sorry sir i wanna ask, why on the I1 the inductor become sort?, *ps still new at learning inductor conductor stuff and sorry for my bad english since its not my first language
When there is a steady state voltage source (in this case the 8V source) the inductor offers no impedance to a steady state current and acts like a short. For an inductor to have impedance, the current needs to change.
@@MichelvanBiezen Why dont you do the same in the second circuit? v=10, It has the same form!
Hello, why do you not do the same process in the second circuit? Is the 10 ∠ 0 not considered a steady state voltage source?
The 10 V source is given as 10V (cos 4t) which indicates that it is a time varying source
Since the two voltage sources are working on different frequencies (4 rad/s for the left source, 0 for the right source), isn't it incorrect to simply add them, with the result being, instead, 0.791cos(4t - 71.57) + 4?
If they were on the same branch you could add them up that way. (The 8V source is DC voltage). But since they are not on the same branch you cannot.
king of the whiteboard!
I like that title! 🙂
for that 10cost4t voltage, isn't that 10V peak voltage? shouldn't everything be calculated with RMS values when using Ohm's law?
wait nvm, we're not looking for time instantaneous values, rather current through the inductor as a function of time
As it turns out you can use either RMS values or peak values to work out the problems as long as you don't mix them.
@@MichelvanBiezen Oh I see, thanks sir!
Magic...
Glad you think so.
cant we use node analysis here
There are 7 different methods of solving circuits and any method can typically be used. It comes down to a personal preference given the choice.
@@MichelvanBiezen maybe when different frequencies are given then only we use superposition....is this true ?
@@MichelvanBiezen and btw how to find power when diff frequencies present..i cant find any video related pls help
Not sure about what you mean by: "when different frequencies are given".
Typically a circuit has a single power source at one particular frequency.
I think the value of I1 is wrong.
What do you think it should be?