Method to create a high current and low voltage

How would I be able to produce a circuit that produces a very high current at a very low voltage? Would it be considered a reverse Tesla coil?
 

berkeman

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How would I be able to produce a circuit that produces a very high current at a very low voltage? Would it be considered a reverse Tesla coil?
Welcome to the PF. :smile:

Are you wanting AC or DC high current capability? What level of current are you asking for? Can you say what the application is?
 
Welcome to the PF. :smile:

Are you wanting AC or DC high current capability? What level of current are you asking for? Can you say what the application is?
DC high current capability, 200 million amps, research study
 

berkeman

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DC high current capability, 200 million amps, research study
Woo doggies! That's a lot of amps. How long do you need to sustain this level of DC current? How close is the nearest power substation?
 
Woo doggies! That's a lot of amps. How long do you need to sustain this level of DC current? How close is the nearest power substation?
I believe for 0.18 seconds and the nearest substation is 30 miles away.
 

berkeman

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I believe for 0.18 seconds and the nearest substation is 30 miles away.
Your Profile page says you are in Undergrad right now. Do you have an advisor for this research work? What is your budget for creating this facility?
 
Your Profile page says you are in Undergrad right now. Do you have an advisor for this research work? What is your budget for creating this facility?
Yes I do have an advisor and we have a budget of 250k.
 

berkeman

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What degree are you pursuing? Have you looked into charging a (very) large capacitor bank? What capacitance would be needed to store that kind of energy?
 

Baluncore

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How would I be able to produce a circuit that produces a very high current at a very low voltage?
What is a very low voltage? Is it 20uV, 1V or 50V ?

Where will the 200 million amp current flow? That will identify the load voltage, and so the energy storage requirement.
How might you switch such a current?

Are you making a magnetic field using a Bitter electromagnet? If so, have you considered the implications of inductance in the circuit?
There are also Marx impulse generators that produce a circular current rather than a high voltage.

You must explain the application so we do not have to guess which answers might be most appropriate. We probably know many of the possible answers to your open-ended question.
 
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In the 1970s I worked at a plant installing radio controls on the cranes over aluminum potlines. Aluminum is made by passing a high current through a mixture of bauxite and an electrolyte. In one plant there were 8 potlines, each running about 200,000 amps. The pots are in series with about 5 volts across each one and 750 volts across the whole line. The conductors produced about 200 gauss which was enough to saturate the powdered metal cores in the radio receivers and detune them. And yes, this plant was very close to a power station.

As such I am very skeptical of the claim that 100,000 amps is by far the highest current ever produced in the world. By the way isn't RT the name of the magazine that used to be called Russia Today?
 

Baluncore

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As such I am very skeptical of the claim that 100,000 amps is by far the highest current ever produced in the world.
I think the 100,000 amp record was only for a superconductor.
 
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A railgun uses a principle where they charge up a fairly capacitor bank and then discharge it at high current when they want to fire it.
 

jim hardy

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Current density is the limiting factor.

For more reasonable currents in a household experimental environment ,
buy a secondhand soldering gun to take apart and play with.

upload_2018-8-3_12-56-58.png


low voltage high current out of those two stubs.

Junk shops are full of them, around here they go for five bucks..
 

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dlgoff

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dlgoff

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The conductors produced about 200 gauss ..
I thought you were going to say the conductors were jumping around causing damage. :olduhh:
 

Baluncore

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High currents are invariably used for high magnetic fields. The strongest magnetic fields I believe are created using optimised Bitter coils with an explosive compression. The energy involved in 200Mega-amp with a 1 volt drop for 0.2 seconds is equivalent to 40kg of TNT.

It seems the OP has simply reversed the voltage and current specifications of a Tesla coil or lightning strike without considering the circuit impedance R+jX, energy, or the square law. I do not believe the OP is really serious about the question.
 

Svein

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In the early 1980s I was working in an industrial research institute. Several projects had to do with new and non-standard ways of doing things related to the offshore oil business. One project in particular was about detecting internal cracks in subsea pipes using magnetic field measurements. As far as I remember, the voltage used to drive the current had to be below 1V, otherwise the sea water would start to conduct. Since such a pipe is large, there would be very little resistance between the two voltage supply points. Therefore: Low voltage, high current.

I may not recall correctly, but my mind suddenly pictured 0.85V and 100A.

No, I do not know what happened to that project.
 

jim hardy

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Heck. I still use mine.
Me too. Great for car wiring - trailer lights, repairs,
and if you replace the tip with a coil of #12 solid you have a demagnetizer for hand tools tape heads and the like. . Worked great when an unshielded subwoofer underneath my Sony Triniton turned that corner of the screen purple. (today's flatscreens seem unaffected )

Will pick one up for you.

old jim
 

gleem

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CERN's record is only 20 Kamps but that is for a fairly long superconductor. https://home.cern/about/updates/2014/04/world-record-current-superconductor
Isn't it true that the magnetic field that the superconductor creates will quench the superconductor at some critical field.strength limiting the maximum current?

What is the object of OP experiment?

For 200 Mamps an ordinary conductor would have to be short with a large crossectional area. If you do the calcs a 1m long by 10 x10 cm copper buss it would probably explode with that current flowing for a time significantly less than 0.18 sec.

The energy released using E = I2Rt is about 12 GJ for the aforementioned buss would be equivalent to about 1.5 tonnes of TNT

The energy involved in 200Mega-amp with a 1 volt drop for 0.2 seconds is equivalent to 40kg of TNT.
To drive 200 Mamps with 1 V you would need something like a 1 meter cubed block of copper.

Think about it can you deliver that amount of energy in that time frame from any reasonable physical setup. you would blow up the transmission line.

Yes I do have an advisor and we have a budget of 250k.
Not sure about the adviser.
 

berkeman

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What is the object of OP experiment?
Right now it looks like he was just trolling. Still, it generated an interesting discussion about high-current applications in the real world (not his world)...
 

Baluncore

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I may not recall correctly, but my mind suddenly pictured 0.85V and 100A.
When a welding level regulated current passes through a poor weld, there is a change in the flow path of the current that can be detected by magnetic powder, or mapped with hall effect sensors. That technique of crack detection has been used for many years.
 

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