If we have a cap connected to AC source it's power is imaginary.
...but this energy did not convert to another form so this power is imaginary.
What this energy did do is change it's place.
So I am trying to draw this analogy with a ball in space.
Hi,
Reactive power is considered to be not real power but we know this because when we put energy into a system we do not see it dissipate. But looking at the storage of the energy only does not tell us about the whole system. If we had a perfect storage system we could store energy forever, but once we tap into that energy with any real system we loose energy and the loss of energy is the real part. But this whole reactive non reactive thing is mainly used in AC analysis not time domain analysis.
An electrical analog to the ball would be applying a DC current to a capacitor,
Are you referring to the energy stored/released in the electric field of the capacitor, and the rate it is stored/released? There is nothing "imaginary" about that electric field energy. It is every bit as "real" as any other energy you will run into.
What does the above sentence mean? What other energy conversion are you talking about?
Change place with what or where?
So the main question is:
Do we call this power imaginary because:
1) energy did not convert to heat or mechanical motion,
2) because energy went back to the source
3) or the energy stayed in the system?
Another question:
If we just charge up a cap there will be no energy conversion but if we measure voltage and current
while cap is charging there will be power, so is this power imaginary?
I always seem to make a misleading title.I am interested in imaginary not so much in reactive.
Energy is real but power is imaginary.
It did not convert to heat or mechanical motion.
Energy stays electrical but instead in the power source, now it is in capacitor.
So the main question is:
Do we call this power imaginary because:
1) energy did not convert to heat or mechanical motion,
2) because energy went back to the source
3) or the energy stayed in the system?
I always seem to make a misleading title .I am interested in imaginary not so much in reactive.
Energy is real but power is imaginary.
If we have a ball bouncing up and down without losses can we say that complex power = 0+j*x .
Apparent power equals imaginary part of complex power?
If energy did not convert to heat or mechanical, doesn't that mean it stayed in the system?
If energy goes back to the source, doesn't that mean that it stayed in the system? After all, the source is part of the system.
How can the rate of energy storage or usage (power) be imaginary?
In a power triangle reactive power is imaginary.
I hope you mean in the sense that it is out of phase with resistive power.
If we have a ball bouncing up and down without losses can we say that complex power = 0+j*x .
Apparent power equals imaginary part of complex power?
Edit:
OK now I realize I am talking about a ideal mechanical harmonic oscillator so I have to look into that.
Wikipedia suggests some analogy but I don't think power is defined.
https://en.wikipedia.org/wiki/Harmonic_oscillator#Equivalent_systems
Velocity of a weight and force of a spring are 90 degrees out of phase
which means this system can be modeled with complex numbers.
Velocity * force = power
Well it appears to me that you just want to call something imaginary?
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