Hi someone called
903theBest
left a post in electro boom subreddit and asked very good questions, so I had to make a quick video
We know electric current is the amount of electric charge per Coulomb
passing per second now if we get a plastic ruler and rub it against animal fur and charge it
and then throw it. Can we say electric current is flowing?
Does it create magnetic field? What the current flow is when there is a voltage difference?
Where's the voltage is it created when the comb moves? If I vibrate it does it create electromagnetic fields?
What if the charge is stationary and the observer moves will there be electric potential created?
What do you think? Pause and think about it. the answer to all these questions?
Is yes answer number one
Yes
if we throw a charged ruler it is considered electric current if we put one Coulomb of charge on the ruler and
Throw it at a speed of one ruler length per second
It will be one amp of current
Now answers three and five are related would we have voltage potential if the ruler or the observer move? Yes!
If you have watched my last video
You know that voltage is the amount of available potential energy per unit charge or Joule per Coulomb
For potential energy to exist we don't need anything to move if we have Q amount of charge on the ruler at any point in
Space or metres away from the charge
We have an electric field
Equal to this amount which has the potential to spend energy on any charge present in this spot
Which means that we have electric potential and if anything moves through the electric field of the ruler no matter if the ruler or the
observer is moving we create voltage. Look at this experiment
I place my multimeter here measuring millivolts the probes are not touching anything, and if I bring my hand close
It's not picking up any voltage
Now if I discharge my ruler and bring it close
it still doesn't pick up much voltage, but if I charge it
and then bring it close
Look at that I'm making a lot of voltage across the probes
Isn't it great? I'm making voltage by manually moving charges
Now if I stop moving the ruler the voltage drops back to zero because the meter circuit resistance
diffuses the electric energy at the probes, but as soon as I move it
I have voltage and of course the same thing happens if the ruler is stationary and I move the probes
Now let me show it to you on the scope. I have my scope probe here and
My discharged ruler. Now if I charge the ruler and move it around the probe
You see that I'm creating voltage waves isn't it awesome?
What you don't share my sense of joy?
Answer number two? Yes, moving charge or electric current creates magnetic field let's try it
I'm passing 10 amps through this *ow*
hot
Anyways, 10 amps through this wire now if I bring my charged ruler close
And move it around
hm
It's just attracting
The hell- oh ---- I know
Well in a wire when we run DC or low frequency AC
Current the positive and negative electric charges are pretty uniform and equal
So the electric charges cancel each other and all we have is magnetic force, but in my ruler
I have static electricity that even now that I don't have any current running through the wire it
Attracts the charges in the wire the electric force here is much stronger than the magnetic force
If there was only magnetic force here
I would expect the ruler to
Attract the wire when I moved it one way and repel it when I move the other way, but now it's just attracting
So although it's creating magnetic field. I can't demonstrate or measure it here
Do you remember Coulomb's law from my previous video showing the force between two charged metal balls? It only works if the balls are
Stationary as soon as they move the magnetic field created between them affects the force
The wire melted the ---- out of my plastic clamps and
Finally answer number four of course if I shake it
It makes it after all it's filled with charges that create electric fields around it
And I'm shaking the fields creating electric waves in the universe and of course moving charges are electric current
Which makes magnetic fields in space too- it's funny, though in a wire at low frequencies?
We pretty much only make magnetic fields because like I said the opposing charges are equal and pretty
Uniformly spread but with this ruler
I'm making electromagnetic fields probably more electric than magnetic even it was a very good question
novecientos tres the best
Thank you. No, this was a good question, and I thought to make it public
But I don't want to spam my channel with the follow up videos to my electro boom 101 series so later if I want to
Make quick general follow-up videos to my electro boom 101 series like solving problems and answering questions
ill just make it private and i'll put a link to them in my website
electroboom.com so if you're interested to learn the supplement information you can go there and watch them
*ending theme music*