Return path ground is very important for electrical circuit to be completed. In 3 phase circuit 3 phase four wire if load is balanced the load star point is at the zero potential and hence will not make any difference,but with unbalance load current equal to vector resultant must flow to ground to keep the voltage …. The charge is the property of matter because of which the matter experiences the force of attraction or repulsion in an electric field.
Whereas the current is the rate of flow of charged particles called electrons. The coulomb is the unit of electric charges, whereas the current is measured in the amperes. Voltage and amperage are two measures of electrical current or flow of electrons. Voltage is a measure of the pressure that allows electrons to flow, while amperage is a measure of the volume of electrons.
The current in a circuit is directly proportional to the electric potential difference impressed across the circuit and inversely proportional to the resistance of the circuit. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Physics How does distance between plates affect capacitance? Ben Davis August 25, How does distance between plates affect capacitance? What is the formula for parallel plate capacitor?
What is the area of a parallel plate capacitor? How do you find the charge of a parallel plate capacitor? What is the electric field inside the capacitor? Opposite charges attract each other, creating an electric field,. If the distance becomes too large the charges don't feel each other's presence anymore; the electric field is too weak. It is obvious that as the distance between plates decreases, their ability to hold charges increases. So, with decreased distance q increases, and so C increases.
Capacitance is charge per EMF. Specifically Farads are Coulombs per volt. As you move the plates closer at the same applied voltage, the E field between them Volts per meter increases Volts is the same, meters gets smaller. This stronger E field can hold more charges on the plates. Remember that the charges on the plates would otherwise repell each other. It takes a E field to keep them there, and the stronger the E field the more charges it can keep there. The higher charge at the same voltage means higher capacitance more Coulombs at the same Volts.
To get technical, you want to look at Coulomb's law. This states that. If you want to start getting really technical then you need to start reading up on quantum mechanics and the interactions between particles and the energies involved in it. When two particles say electrons in this case interact they send quantum particles between them photons. These, like the rats in the basement, require energy to move. The greater the distance the higher the energy. The higher the energy taken to move the photons the lower the charge left between the two plates.
That's a very simplistic view of it and there is one helluva lot more detail in there to be discovered - such things as Quantum Tunneling, Leptons, Fermions, Bosons, etc. It's fascinating reading if you have the time.
Follow that up with F. While both these books are getting a bit long in the tooth now and the theories are all still evolving, they give good insights into the workings of the universe at a subatomic level.
When the plates are far apart the potential difference is maximum because between the plates you travel through a larger distance of the field, and the field also isn't cancelled out by the field of the other plate , therefore the capacitance is less. When there is a dielectric, the electric field decreases i.
For the same charge, less potential is required, because the close proximity of the plates allow the potential to be partially cancelled, and therefore this ratio is called capacitance, because for the same potential you can achieve more charge on the plates. A key thing to understand is that if a plate has more electrons coming in than going out, it's going to build up a negative charge which will serve to repel any more electrons from coming in likewise for a plate with more electrons leaving than arriving.
It wouldn't take very many electrons coming into an isolated plate for the charge to build up to millions of volts. If, however, there is a positively-charged plate near the negatively-charged one, the positively-charged plate would try to pull electrons toward itself and consequently toward the negative plate likewise the negatively-charged plate would try to push electrons away from itself and consequently away from the positive plate.
The force from the positive plate trying to draw in electrons cannot completely counter-balance the force of the negative plate trying to push them away, but it if the plates are close together it can counterbalance it significantly. Unfortunately, if the plates are too close, the plates won't be able to build up too much of a charge before electrons start hopping from one plate to the other. It turns out there's trick to ease this problem.
The breakdown voltage is the voltage at which the failure occurs, and the material is no longer electrically insulating. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Physics How does capacitance change if distance is halved?
Ben Davis February 12, How does capacitance change if distance is halved? Does capacitor charge change with distance?
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