High voltage Definition and 164 Threads

Hi, Power transmission over long distances from power plants to local power grids is often done over DC with relatively high voltages/tensions. The argument for this is that since, by Joule's law, power dissipation due to heat by a resistive element is given by I^2 * R, lowering the current...

Using a neon 15kv transformer rectified (NTE5342@ 40 amps) to dc at the transformer input, I don't want to rectify the high voltage ac to dc at the output (cost factor and lack of knowledge to do so), the 20 amp house breaker pops after a few seconds without a load on the transformer. Is this...

I'm a bit confused about why power is transmitted at high voltage for transmission over long distances. This is generally explained as reducing Joule losses, P = I^2 R, and we minimize the current by maximizing the voltage. However, a trivial re-arrangement using Ohm's law gives also P = V^2...

I need to upgrade voltage panel meters displaying DC voltage from the output of a high volt rectifier. The present meters are obsolete and use an input coming straight from the power supply. I think I need to install some kind of signal conditioner to display voltage from 0 to 800 DCV output...

What happens if you take a high amperage supply from a transformer so that current was forced to flow a certain way in a conductor and you arc a high voltage supply over to this conductor also would you have high amperage and high voltage?

Suppose a capacitor is initially charged up to 2V, and then a 1V DC voltage source is used to discharge the capacitor to 1V, what is the energy consumption from the voltage source and what is the total energy loss? Assume the capacitor is connected to the voltage source using a resistor and...

Hey all, I've got a high voltage power supply that I need some sort of connector for. It's a 40kv 15ma output and the connector screws in over a hole that leads to an enclosed plastic tube with a metal rod about halfway down. Are these standard connectors or do i need to do something crazy to...

Hey PF, My old PSU from my computer blew and being a techy I desolded all the capacitors and micro resisters. I currently have 2 x 200V 470u(micro)f and a 105k 250V capacitors and was wondering how I can charge them to there max capacity. Is there any easy and non dangerous way to do...

I have made an attempt at understanding electric field and the effect they have on electrons by making the following test (see attached picture). What I did was take a 12 volt battery and connect a fan of a psu with it so the fan starts to turn by the flow of electricity, of course. I then...

High voltage supply questions! :) Ok, well a few friends of mine have come together to build a fuser and an electron accelerator. I have obtained an NST at 20ma 6 kv DC , but would like to build a crockcroft walton voltage multiplier for the accelerator. My question is, will this setup run off...

Hello ,people I don't understand what is the use of Low Pressure and high voltage in cathode rays experiment and why do beams of electrons are produced under these conditions? Thanks in advance...

Hi this is my first post on here I am looking to create a large voltage across a primarily capacitive load at around 190 kHz. At the moment i have a 175 Watt power amplifier which puts out 55 Vp. The output impedance also needs to be quite low < 100 ohms Does anyone have any idea how to...

Hello everyone, I could not find the solution for my problems by searching the forums. Thus I am writing them here so would you guys please help me. There are two problems but it is not good to create two topics for this so I combine them here: 1. High Voltage Amplifier: We often work...

Hi! I am looking for a way to measure the voltage on a Kelvin Water Dropper that I've built. This is quite problematic since the charge is small and the voltage is high. The only way to do it, as it seems to me, is to measure by influence. Any suggestions?

Homework Statement We know that current will flow whenever there is a potential difference. Sometimes when there are problems with high voltage lines - workers must work on them 'live' (not shut down). How do the workers manage to work on the wires without getting electrocuted by the high...

Is there any circuit which can reduce voltage hundred times (100x), i got 5kV DC and my plan is to low that 100x and measure with multimeter. Is that possible?

Happy holidays everyone! I'm searching how to produce high voltage, high current DC electricity to be used for statically charging a giant electroscope. The explanation why is very elaborate, so to put it simply, I need to energize a giant electroscope. I have limited electrical...

Hello, i actually more natural with spanish, so sorry if any words are bad writed. I come for help, I am trying to simulate electromagnetic fields in high voltage transsmision lines, i need a code that simulate it. If any of you have a code, or know of a program that do the job i will apreciate...

hi everyone I am new here and no nothing about physics. with that being said, what would you do in order to run over 96V but get no amps or get very little amps...

I have a physics question that I'm hoping someone has enough free time and is intrigued enough to figure out for me! My sister just bought a house which is near some high voltage power lines. I've heard that people living near these types of lines can sometimes induce a current in wires...

why is a high voltage 750 miliamps fuse rated as 5 KV and not as 250 volts

Honestly I do not think automotive techs would know the answer to this question so being said from a physics stand point about the relationship between the high voltage spark on a spark plug and compression in a engine. I have had experiances where there was spark on the plugs but the engine...

I just ordered a DC to HV DC converter (the F40 model, datasheet here: http://www.emcohighvoltage.com/Fseries.PDF ) from eBay for $50. My intent is to charge capacitors such at the 400V 12,000uF one located here http://www.amazing1.com/capacitors.htm. The converter has output up to 4,000V...

hallo, what is the reason for sparks once i have a high voltage short circuit? Thanks, Omri

I'm supposed to write a brief essay response to this question on my unit exam, and I don't exactly understand it. Please explain it to me, and then I can appropriately write the short essay. Thanks! Homework Statement "The energy companies use step-up transformers to send high voltage...

I have an idea to build a electromagnet out of superconducting wire out of the Tl2Ba4Ca2Cu10Ox superconductor discovered earlier this year that's superconducting at 40 degrees below zero in Fahrenheit and I'm wanting to supply 1 million volts or a little more to it and see what happens. and...

Hi, I tried to charche a plate capacitor with some 20 Volts but when disconnecting the cables from DC supply the voltage goes down to zero. Why is this? Cables too long? Didnt I wait enough or does a plate cap need high voltage (5000 Volts) and why does it? I am a theoretical physicist and have...

Hi All, Is there a simple explanation for the fact that in power stations (where electric energy is created) the voltage applied to the conducting wires, which will carry the energy to the city, is much higher than 110 V ? Thank you all Best Wishes DaTario

Hi, I am currently investigating stream of water under high voltage. My setup is using two aluminium plates connected to high voltage power supply with a burette running water between two plates. I found out that the water stream only deflects to one polarity ( i.e. positive/ negative ONLY )...

When I connect 3V negative and 3V postive power supply to an OP07 op amp and I Connect a voltmeter to OUT of op amp and GROUND the voltmeter shows -1.8 volts why? I have connected anything to input I even tried shoring the input and this voltage is too high to be offset voltage. I Tried two...

Electrical "bonding" in high voltage line maintenance Consider a high voltage line worker about to exit a helicopter on to a high voltage "live" line, as in this video : As the helicopter approaches the HV line, the worker holds out a conducting rod. I am led to believe this is to...

If you raise the voltage you must raise either the current or the resistance since V = IR. So how does a wire with higher voltage and lower current have less resistance? It should have more resistance to make up for the lower current.

I'm working on building an electrolysis device in hopes of creating a healthy supply of hydrogen. I tried building a high voltage DC to DC upcoverter based on a tutorial found on http://www.instructables.com/" With the new transistor, I was able to feed 5v from a computer psu without...

If I'm using a weak signal like from a tiny magnetic reader, how do I get it to trigger a 120 volt coil?. What electronic hardware do I need to wire in between? Or what type of switch can do this? Thanks.

Hi guys, I have been wanting to many electrical experiments over the last few years that need a high voltage power supply, till now I havnt found one suitable for me and thus wondering if anyone here on the PF has any suggestions. I don't exactly have a large budget, In fairness I would like to...

Hello All! Quick question... When a high voltage capacitor is charged to say 3000 volts, a spark will jump across the terminals. Does the spark jump from the positive to negative terminal, or from negative to positive? Thanks Very Much! Bill

Good day every one, My name is Thebe and I like to play around with low voltage electronic devices, currently I have an electronic system that I am trying to build on 24 volts but the problem is that some of the wires in my circuit must run next to a very high voltage cable so I am concern...

I have a 20kVDC pulse flowing to an igniter. 2500 pulses per minute. I want to know if it is possible to use the high voltage pulses of DC to induce sufficient voltage in a coil wrapped around the power cable (through which the current is flowing) to energize an LED (in synch with the pulses)...

Hi everybody, I need to indirectly measure the high voltage across a wire, which is one of the leads to a spark gap. I ran the wire through a coil inductor(air core) and measured the voltage across the coil leads with an oscilloscope when i get the spark. I also connected a resistor in series...

Could fusion be generated with very high voltage?? Using a Van De Graaff (VDG) machine, we can easily generate million-volt high voltage. The high potential difference can be generated effectively with minimum energy supplied to the machine. The larger the volume of the machine would be, the...

Using a Van De Graaff (VDG) machine, we can easily generate million-volt high voltage. The high potential difference can be generated effectively with minimum energy supplied to the machine. The larger the volume of the machine would be, the higher the voltage could get. However, stability would...

Okay I have a question for you engineer types. I teach a little high school physics and something has struck me as slightly odd in what they get taught. They learn about transformers and are told that a major application of them is in electrical power transmission. They are told that since the...

When I plug my NST into the wall at 60 Hz, I've been told a 120 Hz AC current comes out of my NST. What happens if I modulate the input frequency with a function generator to the transformer?

how do i do high voltage frequency? i have been working with a 555 timer but i want to do a square wave 100 to 300 khz at up to 100 volts and 3-6 amps so i need something much larger any recomendations? thanks

I've recently become very interested in designing efficient motors and alternators for use in a gas turbine hybrid electric vehicle. I feel that these designs may be able to achieve uniquely high power to weight ratios compared to the components in commercially available hybrid electric...

Hello All, I'm now looking for yet another component for my experiments. I was doing some research into DC boost converters to figure out how to build my own (they seem pretty simple to make). I want to make one that can be programmed from a microcontroller to put out variable voltages from...

so I need to construct a device that creates a high voltage arc for an experiment, unfortunatly I don't know how to amplify the voltage without a series of transformers. I believe there is a way of doing this with a few capacitors, and right now I have about a dozen 12 MFD capacitors, and a...

I seem to understand transformers very well, but one aspect of stepping up voltage for transmission is confusing me. I'm sure it is a very small oversight on my part. In an ordinary electric circuit, when the voltage is increased, keeping the load resistance the same, the amount of current...

how do you minimize resistance on a power line if there is a large amount voltage and low amperage being sent through it to a house and the house ends up with a lot of power? :rolleyes:

I'm very interested in Experiment with high voltage that can show arcs. I also like to modify my swatter ( electric racket to kill mosquito/ flies), it is made in china. About the swatter: -It has only one diode at the secondary winding of the trafo, ithink this is for rectifying the ac...