What charges on high voltage circuits?

In summary, people usually use an electrostatic voltmeter for direct measurement. The current in a wire is carried by electrons, but the convention is to define it as the movement of positive charges in the opposite direction. This applies to both AC and DC currents and can generate a magnetic field. However, the magnetic field from high voltage cables is not strong enough to significantly affect a compass. Additionally, the wires in the circuit cancel out most of the magnetic field. In terms of charge on the circuit, there is virtually no net charge as the wires are highly conductive.
  • #1
oem7110
151
0
People usually use an electrostatic voltmeter for direct measurement.
I would like to know what kind of charges is on following high voltage circuits.
Will it be positive or negative charges?
Does anyone have any suggestions?
Thanks in advance for any suggestions

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  • #2
Charges which flow (current) are always the negative charges. The electrons move, the protons in the nucleus don't really move.

The current, though, is defined as the movement of positive charges in the other direction. This is due to a bad convention that historically people used.
 
  • #3
Matterwave said:
Charges which flow (current) are always the negative charges. The electrons move, the protons in the nucleus don't really move.

The current, though, is defined as the movement of positive charges in the other direction. This is due to a bad convention that historically people used.

Does it apply AC here? so the charges will change alternatively, so electron and proton does not move a far distance.

If there is a massive negative charges moving along the cable, does it generate any magnetic field? which distorts the north within the compass.
Does anyone have any suggestions?
Thanks you very much for any suggestions
 
  • #5
oem7110 said:
Does it apply AC here? so the charges will change alternatively, so electron and proton does not move a far distance.

If there is a massive negative charges moving along the cable, does it generate any magnetic field? which distorts the north within the compass.
Does anyone have any suggestions?
Thanks you very much for any suggestions

Always (in a wire anyways), the neucleus doesn't move much. For AC current, it's the electrons that move in alternating directions. A magnetic field is produced, and it is produced even in the constant DC current case.
 
  • #6
Matterwave said:
Always (in a wire anyways), the neucleus doesn't move much. For AC current, it's the electrons that move in alternating directions. A magnetic field is produced, and it is produced even in the constant DC current case.

So does compass not work very well near the high voltage cable? right?
Thanks everyone very much for any suggestions
 
  • #7
I've never noticed any influence on a compass when walking under high voltage cable.
I think the needle can't react fast enough to move with the 50 or 60 Hz oscillations of the magnetic field, and the average field will be zero with AC.

Of course, a magnetic field is produced by a high current, so the magnetic field isn't all that big, because the current might be only 1000 A or so, you can't get close to it, and there will be wires with currents in the opposite direction that will cancel out most of the field.
 
  • #8
What do you mean by "Charge on the circuit"? Virtually, there is no net charge on the circuit or hardly any since wires are highly conductive. Actually, it is a flow of electrons, which carry negative charge, but whenever you take a section of the wire there is no net charge, although electrons are moving.
 

1. What is a high voltage circuit?

A high voltage circuit is a type of electrical circuit that operates at high levels of voltage, typically above 1000 volts. These circuits are used in various applications such as power transmission, industrial equipment, and scientific research.

2. How do high voltage circuits work?

High voltage circuits work by using a power source, such as a battery or generator, to create a high level of voltage. This voltage is then transmitted through the circuit to power devices or equipment. The circuit also includes components such as resistors, capacitors, and inductors to control the flow of electricity.

3. What are the potential dangers of working with high voltage circuits?

Working with high voltage circuits can be extremely dangerous if proper precautions are not taken. The high levels of voltage can cause severe electric shocks, burns, and even death. It is important to always follow safety protocols and use protective equipment when working with high voltage circuits.

4. How are charges created and controlled in high voltage circuits?

In high voltage circuits, charges are created and controlled through the use of power sources, such as batteries or generators, and various components such as capacitors and resistors. These components help regulate the flow of charges and maintain a stable voltage level within the circuit.

5. Can high voltage circuits be used for renewable energy?

Yes, high voltage circuits can be used for renewable energy sources such as solar panels and wind turbines. These circuits help transmit the energy generated by these sources to power homes and businesses. However, proper precautions must be taken to ensure the safety of workers and the general public.

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