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Electrostatics
Electrostatics is the branch of physics that deals with the study of charges at rest. A common electrostatic phenomena is plastic wrap sticking to your hand and itself when removed from the box. Everything to do with electrostatics goes in this category.
1,860 Questions
Lightning is electricity. How is charge conserved when lightning strikes?
Because there is a difference in the charge states of the earth and the clouds, resulting from the static electricity built up by water molecules moving about in the thundercloud. When this difference in charge states is equalized, there is usually a visible arc, which we call lightning.
What is static electricity measured in?
I believe it is measured in watts.
Static electricity is measured in volts. Most static electricity discharges are measured in Kilovolts. Lightning is measures in Megavolts.
Would the generation of static electricity consume power?
It takes energy to create static electricity, so in that sense, there is power applied to make it. Static electricity is generated by friction. Even the movement of air over the land creates friction enough to move static charges. Force has to be applied to generate the charge differential. You walk across a rug and get zapped on a doorknob. A tiny amount of the energy you expended walking was used to separate the charges that got you lit up. It seems we are always seeking a way to get something for nothing in the world of power generation. It ain't happening here. It takes power to create power, even in the world of static electricity.
Drawing of speed-torque curve for synchronous machine?
Theoritical torque speed curve for a synchronous machine will be a vertical line located vertical to the synchrounous speed at x axis, from starting torque to stalling torque value. This is because theoritically synchronous motors are not self starting. Practically however they start as induction motors and at near synchrounous speed the excitation is switched on. Anand Sekhar
Why induction motor speed is always less then synchronous speed?
induction motor never runs at synchronous speed, if it does so there would not be any relative speed between stator flux and rotor and no emf will induce in rotor and we can not apply motor principle as we need current carrying conductor in magnetic field.
What are the base units of charge?
The coulomb. It is the charge transported by 1 ampere of current in 1 second.
What is the difference of static electricity and current electricity?
Current electricity requires an energy source, it would not flow unless there is a complete circuit to flow through continuously and it only flow through conductors where as static electricity does not require all of these. Static electricity can have extra protons or electrons and there foe can be either positively or negatively charged. Current electricity is simply the flow of electrons(negative).
Why are non metals poor conductors?
Non-metals are poor conductors of electricity because they lack free electrons that can move around to carry an electric current. In non-metals, electrons are tightly bound to the nucleus of the atom, making it difficult for them to move freely. Additionally, non-metals have high resistance to the flow of electric current due to their atomic structure.
What is the Relationship beteen Capacitance and frequency?
The short answer to the question is the capacitive reactance of a capacitor in a DC circuit is infinite.
In a DC circuit, disregarding transient behavior and any leakage effects, a capacitor is effectively an open circuit, and so its reactance is essentially infinite.
Capacitive reactance is calculated as Xc =1/(jwC) where w is the angular frequency in radians per second, w = 2*pi*f, C is in Farads, and f is in Hertz.
With DC, both f and w are zero, and, theoretically, the formula,
Xc =1/(jwC) = limw-->0 [1/(jwC)] becomes infinitely large. In any practical circuit, however, there is always some leakage, so the impedance of the a capacitor will be quite large, on the order of megohms, but still finite.
Why is the electrostatic potential due to an electric dipole at an equatorial point zero?
Because it takes no work to bring a test charge in from infinity along the
perpendicular bisector of the dipole (any line in the equatorial plane).
At least, that's true for any distance that's much greater than the separation
of the two charges that make up the dipole. In that case, the potential is
proportional to cos(angle between the line joining the charges and the direction
from its midpoint to the test charge). That's the angle that's 90 degrees in the
equatorial plane, and its cosine is zero.
What happens when charged objects are brought near uncharged objects?
well if two bodies negatively charged are brought near each other, then there is a strong force of repulsion, as the electrostatic lines of forces terminate at these bodies, they exert later pressure on each other, hence the bodies repeal each other
What is the main difference between speed and velocity involves?
Velocity includes the information on what direction the speed is pointing.
60 mph north and 50 mph north are different velocities.
60 mph north and 60 mph west are also different velocities.
Speed doesn't care what direction it's going.
60 mph north and 60 mph west are the same speed.
60 mph 50 mph are different speeds.
What happen when a plastic ruler rubbed vigorously with woolen cloth?
Both get charges oppositely. So they would attract each other if we bring them closer
How a charged rod placed near an uncharged metal object can repel?
When a charged rod is brought near an uncharged metal object, it induces a separation of charges within the metal object causing the electrons to move away from the charged rod. This separation of charges creates an attractive force between the charged rod and the metal object, leading to the repulsion of the metal object.
What happens to an object with a positive charged and an object with a negative charge?
Dissimilar charges attract.
What are the rules for magnetic poles?
the laws of magnetism are electrons have to line up,opposite ends attract and the same repell
AnswerTwo equations governs MagnetismGausses's Law for magnetism: Div (H) = 0 where H is a vector
Ampere's Circuital Law: Curl(H) = J + dD/dt H, J and D are all vectors also.
H is magnetic field intensity J is current density D is electric flux density
Ewan q kung ano sag0ot
A:
There is a North and South pole, and when you take another Magnet and try to make it attract to the other Magnet, It will.. But if you put South with South, it won't attract, if you put North with North, Won't attratc ethier =}
Zoe did this answer
What type of electricity is supplied to the home?
The electricity from power plants travels for many miles. It travels over long wires called transmission lines. These transmission lines are held in the sky away from the ground by giant wood or metal transmission towers. Another way it is transmitted is through underground cables which can go under rivers, lakes and even seas.
When the electricity gets near to your town, it goes into a substation. A substation often has many wires and metal containers in it and is surrounded by a wire fence. The substation divides the electricity and sends it in different paths over wires called distribution lines. These distribution lines take the electricity to your home.
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Most developed countries distribute electricity over something called a "national power grid" which is a nationwide network of very high voltage 3-phase ac (alternating current) transmission lines which are fed by many electricity generating stations - known as "power stations" - which are either operated by the government or by private businesses called power utility companies.
Power stations produce the electricity either by burning fossil fuels - such as coal, gas or oil - or the gases produced by the controlled biodegradation of domestic waste (trash or rubbish) or the waste products produced by farm-animals - which is known technically as "slurry" but many people would just call "animal poo" - or by using other sources of energy such as high waterfalls, nuclear power, solar energy from the Sun, wave energy from the sea, etc.
The nearest available power utility company's generating station typically supplies its nearest towns - or a whole city (or county) district - with high voltage 3-phase power and distributes it as separate lower voltage single-phase services, one phase per street or group of streets, so that every house, commercial office and/or industrial building situated on those streets gets its single-phase power.
The number of phases delivered from the street to a building depend on its power usage requirements: domestic homes and commercial offices typically only use single-phase lights and appliances, so such homes and offices usually only require single-phase power to be delivered from the street.
In addition, at extra cost, the local electricity utility company can install 3-phase power services for any buildings or sites - such as, for example, engineering workshops, vehicle repair garages, industrial factory buildings, mines and ore smelting sites, etc. - which must use powerful machine tools, motors, ovens, etc. that have to run on 3-phase power.
Can power be stored in capacitors an be utilize to supply a small home with power?
In theory, yes. In practice, no because the capacitors needed to do this would be several times the size of the house and much too expensive to purchase.
Use rechargeable batteries. Because they store energy in chemical form instead of just an electrostatic field they can store orders of magnitude more energy than capacitors can.
What is the most common method of preventing the accumulation of static electricity?
The most common method of preventing the accumulation of static electricity is grounding. Grounding provides a path for the static charge to dissipate harmlessly into the ground, reducing the risk of static discharge. This is often achieved by using conductive materials or grounding straps.
What is the difference between magnetic vector potential and magnetic scalar potential?
A vector is a quantity with both magnitude (strength) and direction. Like a force having a strength in pounds and a direction. Or a wind having magnitude (in mph) and direction (Northeast). A scalar has only magnitude. Like the length of a segment or amount of peanuts in a jar. Scalars are just numbers.
Can a electrostatic act on a distance?
Yes, electrostatic forces can act over a distance. These forces result from the interaction between electrical charges and can cause attraction or repulsion between charged particles, even when they are not in direct physical contact. The strength of the force decreases as the distance between the charges increases.
What are 3 types of Electrification?
Three types of electrification are overhead line electrification, third rail electrification, and diesel-electric electrification. Overhead line electrification uses wires suspended above the tracks to provide power to trains, third rail electrification uses a rail alongside or between the tracks to supply power, and diesel-electric electrification uses a combination of diesel engines and electric generators to power the train.
What is the idea behind him about Fleming's left hand rule and right hand hand rule?
Fleming's right hand rule (for generators) tells us that if we take our right hand and extend the thumb, and also the index and the middle finger such that they are all at right angles to each other, we can discover the direction of the current induced in the wire of the generator. We'll have to know the direction of the motion of the conductor, and the direction of the magnetic field to do this. *Special note: the direction of the induced current will be the direction of conventional current in this mnemonic. Conventional current is the flow of positive charges in a conductor. We currently know that it is the negative charges - the electrons - that flow when current flows in a wire. But back in the day, theorists modeled the flow of positive charges, or what we call conventional current, and Fleming was an "old school" guy who worked with this conventional current. Let's apply Fleming's right hand rule to discover which way conventional current will flow in a wire in a generator. As stated, we have to know the direction of the motion of the conductor and the direction of the magnetic field. We have our right hand out and the thumb and first two fingers at right angles, each to the other. The thumb will point in the direction of the motion of the conductor. The index finger will point in the direction of the magnetic lines of force. We have motion of the conductor and the direction of the magnetic field. The middle finger will now point in the direction of conventional current flow in this mnemonic. Electron flow will be the opposite of that conventional current, if you are interested. But you knew that. Wikipedia has an article on Fleming's right hand rule, and a link to that post is provided below. The drawings alone are worth the trip over there, and the page is posted free of charge. Why not take advantage of this offer and check it out? It'll be worth it, and you won't get Rick rolled. Promise.
