Does energy have speed?
Yes, in a vacuum it’s c
If power the rate at which energy is transferred, then does that transference have a speed? And have we or can we measure it?
Submitted 1 hour ago by Patnou@lemmy.world to [deleted]
Comments
Brkdncr@lemmy.world 1 hour ago
brucethemoose@lemmy.world 1 hour ago
You’re getting at a real mathematical thing. First some background:
In physics, the derivative of position, with respect to time, is velocity. In other words, if you measure the slope of a graph of an object’s position, you get its velocity.
The second derivative is acceleration. The third derivative is called “jerk,” or which is basically acceleration of acceleration.
Similarly, the derivative of energy, with respect to time, is power.
The second derivative of energy is what you’re describing.
This isn’t a commonly used unit though. In electrical systems its sometimes used as a “slew rate” rating, but it’s different than the units and measurements used in relation to frequency and AC power.
Patnou@lemmy.world 1 hour ago
Ok let me get this straight. Velocity is the rate at which an object goes in a direction. That slides right into acceleration or how fast the destination near or further is changing? Hope I am good this far. So with that said then one of those dimmer lights for example if i put it on low the transfer rate will be slower but if I immediately hit the max it will be faster? kind of like a power supply changing it’s current. And if the slew rate signal is fast enough it will distort at the end? So basically to go to point A to point B I have to have a velocity and destination. Which would be B and origin would be A. At the rate I get there is the acceleration on top of acceleration. But at some point going from A to B I can in theory be possible to break a “slew point” with acceleration. But in the end it will come out messed up. But what is the speed at which one can go up to and through the slew point without overloading it? Would this not be an input of measure going from point A to point B? again thank you for the discourse and before I forget have a happy 4th.
brucethemoose@lemmy.world 34 minutes ago
I’m not sure I follow; power and energy have nothing to do with velocity or acceleration in this context, its just meant to be an analogy.
So with that said then one of those dimmer lights for example if i put it on low the transfer rate will be slower but if I immediately hit the max it will be faster? kind of like a power supply changing it’s current. And if the slew rate signal is fast enough it will distort at the end?
If you flick a dimmer fast enough, it might distort, yes? But its unfortunately more complicated than “range of change of power” and has to do with how modern dimmers works.
So basically to go to point A to point B I have to have a velocity and destination. Which would be B and origin would be A. At the rate I get there is the acceleration on top of acceleration.
Not exactly.
Where you are is your position.
The rate you get there is speed.
If you speed up or slow down, that’s acceleration.
And how “smooth” your acceleration is is what we call “jerk.” Slamming on gas or brakes would be a high jerk value, gradually pushing the petal until its all the way down would be a low jerk value.
But what is the speed at which one can go up to and through the slew point without overloading it? Would this not be an input of measure going from point A to point B?
Not sure I follow this, sorry. But if you’re talking about overloading electrical components, unfortunately this is really complicated and gets into how AC circuits work.
And as another random suggestion, you may want to look up dimensional analysis. If you’re trying to wrap your head around how stuff is represented, that’s it.
For example:
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We measure position in meters (m).
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We measure speed in meters per second. meters / seconds, or m/s.
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Acceleration is meters per second, per second. meters / (second * second), or m / s^2.
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Hence jerk is m / s^3
Energy is trickier to wrap your head around.
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“Force,” aka how hard you push on something, can be measured as the acceleration of mass. Its unit is kilogram * meter / seconds ^2, or kg * m / s^2
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Energy is force * distance. So kg * m^2 / s^2.
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Power is energy per second. So kg * m^2 / s^3.
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And what you were initially describing seems to be kg * m^2 / s^4.
Here’s another way to look at it.
What happens if you divide power by velocity? In other words, how “fast” is the power moving?
Well, that’d be:
(kg * m^2 / s^3) divided by (m/s)
And what do you get? kg * m / s^2. That’s force!
So maybe “force” is the answer to your original question of “what’s the ‘speed’ of power moving through stuff called,” if I’m interpreting it right.
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slazer2au@lemmy.world 52 minutes ago
one of those dimmer lights for example if i put it on low the transfer rate will be slower but if I immediately hit the max it will be faster?
No. Energy always travels through a medium at the same rate. The amount of energy you put into the light bulb won’t change speed the light is going between the emitter and the surface it reflects off.
Patnou@lemmy.world 1 hour ago
Haven’t read your response yet but can tell this is going to be a discourse thank you so much…no sarcasm.
marcos@lemmy.world 1 hour ago
Yes, it’s power…
I think you are trying to ask something different from what you actually wrote.