How long does electric current flow from the brain after it dies?
If "dead" means brain dead then you've answered your own question, there is no activity left.
1 person found this useful
It may not be correct to say that an electric current will "flow into" circuits. Electrons move in a circuit in response to an applied voltage. And these electrons are alread in the circuit and available to support current flow if a voltage is applied. It may be more correct to say that electrons… leave the negative terminal of a voltage source, and electrons enter the positive terminal of that voltage source. The electrons in the circuit that are availble to support current flow will "shift over" to create the current flow. Remember that the phenomenon of current flow in a wire is the "shifting over" of electrons in the wire. It's not about electrons going into one end of a wire and those same electrons coming out the other end. Use the link to the related question for more information that might help make things clearer. (MORE)
There is a potential difference (voltage) between two points and a path for electrons to travel from an area of low potential (negative) to an area of high potential (positive). Note the direction of "current flow" is opposite the direction of electron flow. In other words current flows from positiv…e to negative. In a circuit involving only a resistor, the current flowing in the circuit is given by I=V/R where I = current, V= voltage, and R=resistance. (MORE)
Answer its lightning, for a more simple answer...... electric current flow is the movement of charges. Most often, however, we consider electric current flow to be moving electrons, or electron current flow. We most often use the term electric current flow to refer to the moving electrons, the flo…w of which is measured in amperes. Earlier scientists, before the discovery of electron, do believe that current flows right from positive terminal to the negative. This is known as conventional current flow. So electron flow is always opposite the direction of conventional current. (MORE)
Simple Answer: The definition of a current is a collection of moving charges. Hence for current to flow, one needs charge and one needs it to move. Electric current flows when charge move - that is the definition. Long Answer: One generally sees current flow on Earth with a conductor and… a voltage or potential difference that creates and electric field and charges in the conductor feel a force and move creating current. The conductor may be a wire and the charges may be electrons. The conductor might also be water with dissolved salt and the electric field causes the salt ions to move and it is the moving ions that constitute the current. If you are the Sun and you are producing electrons and protons on the solar wind, then complex electromagnetic fields may have ejected the charges from the sun, but the current that is the charge moving through space is maintained just by the inertial of the particles. You don't need an electric field to maintain the current and you don't need a conductor to hold the charges. For a current to flow, you need net charge moving. That is all. Current is technically charge density times velocity.. (MORE)
Electrical current doesn't work quite the way that you would think. . A simple way to describe electrical current is to imagine a straw filled with marbles. Each marble represents an electron. If you push an electron in one end of the straw, and the straw was full, a marble would exit the other end… of the straw. . However, while that example gives an idea of what is going on, electricity is actually exactly the opposite of that. An electron is "pulled" out of one end of a conductor, which crates an electron "hole". An electron next to the hole moves into that empty spot, and so on and so on. So, even though you could visualize the electricity moving through the conductor as "pushing a marble", it's really "pulling one out" and marbles are moving to "fill the gap". (This is known as hole movement in electricity). . Different metals have different levels of conductivity. The conductivity refers to how easily electrons can move through the metal. The less conductivity, the more "resistance" there is. When electrons are forced through a metal that has a high resistance, heat is generated. This is why the burner on your electric stove gets hot; a lot of electricity is being pushed through a metal that has a high resistance, and therefore gets hot. . The electric flow through Metal by the move of Electrons from one place in that Metal to another place. (MORE)
In the most simple electric circuits, an electric current flows in that circuit in response to the applied voltage. Voltage is electromotive force, and it will cause current to flow in a circuit to which it is applied. In a simple circuit with a DC voltage applied, electrons leave the negative termi…nal of the source and flow through the circuit, then return to the positive terminal of the source. The resistance of the circuit (and the applied voltage) will determine the amount of current that flows.. In complex circuits, the higher degree of complexity demands that more analysis would have to be done to explain the operation. And in a complimentary way, an AC circuit demands a higher level of analysis because of the fact that the applied voltage changes polarity. (MORE)
Electrical pressure, called "electro-motive force" (EMF), is what causes current to flow in an electrical circuit. EMF is measured in volts. Pressure and the quantity of electricity transmitted can be considered analogous to pressure and quantity of water flowing in pipes: the longer the distance…, the higher is the pressure (called the "voltage" for electricity) that is necessary to pump the flow of water (called the "flow of electrical charge, which is also known as the "electric current"). That is why, for long distance transmission, high pressure (voltage for electricity) is required, failing which, the current - and therefore the power - will not reach the intended destination. Instead, it will be lost (also called "dissipate") along the way. We can think of electrical current as the quantity of electricity which will be drawn from the pipeline (= cables for electricity) at the pressure (= voltage) required. (MORE)
The very word current means 'flow'. Electric current is the flow of electric charges. There are two kind of electric charges. Scientists considered the electric current as the flow of positive charges. But in case of solid metals, only negatively charged electrons are able to move freely where as th…e positively charged protons are held firmly within the core of the atoms. So electric current is due to negatively charged electrons. Now we have to differentiate these two. How? Let us consider the current due to flow of positive charges as conventional current flow. Hence conventional current direction is always opposite to the direction of flow of electrons. To keep the charges in motion we need a force to push them. So we use a chemical cell which has electrical potential difference between the two terminals. This potential difference is named as " electro motive force", in short "emf". So emf is responsible to make electric charges to flow. (MORE)
Of course. If you take the batteries out of a flashlight and put them back in pointing the other way, the current goes through the bulb in the opposite direction. It's so easy to reverse the flow of electric current that . . . -- the current coming out of a household electric socket reverses 12…0 times every second , -- the current in the antenna of your FM radio reverses roughly 200 million times every second -- the current in the antenna of your cellphone reverses almost 2 billion times every second, -- the current in the magnetron that makes the microwaves that heat your leftover meat loaf reverses 4.9 billion times every second. (MORE)
The definition of a current is a collection of moving charges. Hence for current to flow, one needs charge and one needs it to move. One gnerally aciees this on Earth with a conductor and a voltage or potential difference that creates and electric field and charges feel a frorce and move creati…ng current. The conductor may be a wire and the charges may be electrons. The conductor might also be water with dissolved salt and the electric field causes the salt ions to move and it is the moving ions that constitute the current. If you are the Sun and you are producing electrons and protons on the solar wind, then complex electromagnetic fields may have ejected the charges from the sun, but the current that is the charge moving through space is maintained just hy the inertial of the particles. You don't need an electric field to maintain the current and you don't need a conductor to hold the charges. For a current to flow, you need net charge moving. That is all. Current is technically charge density times velocity. (MORE)
The unit quantity of electricity is the Coulomb. The rate of electricity flow in coulombs per second is the Ampere, sometimes shortened to Amp. Note: current doesn't flow, instead current itself is a flow rate (flow of coulombs of charge per second.) When coulombs are flowing, the flow rate is… measured in amperes. (MORE)
electric current flows due to the flow of electrons from lower potential to higher potential. It is due to the drift velocity of electrons. .
An electric current is the flow of electric charge, carried by electrons in the conductor. Unless, it is a conducting solution, in which case the currents may be moving ions carried by water. Unless, it is the solar wind, in which case it is the stream of electrons and protons from the Sun carri…ed by the vacuum of space and their own inertia. So, just to be on the safe side, electric current is the flow of charge and it does not matter what the charge is and it does not matter whether it is in a condcutor or interstellar space as long as it is moving. (MORE)
Voltage is the pressure that pushes current through the resistance of the conductor. Ohm's Law: E=IR can be rewritten as I=E/R to explain this. "I" is the intensity measured in amps, "E" is the electromotive force measured in volts, and R is the resistance measured in ohms. Voltage divided by the re…sistance equals the amperage. The voltage pushes valence electrons out of orbit from one atom into the next atom. (MORE)
This answer depends on who you are asking some people say it flows from negative to positive and others say its the other way around but really it doesn't matter that much because normal 60Hz AC changed direction 60 times a sec
The flow of electrons from a body at a higher voltage to one at a lower voltage is flow of current.
In a DC circuit . . . resistance. In an AC circuit . . . impedance.
Electric current flows from a high elecric potential to a low electric potential in a circuit. It is also opposite to the direction of the flow of electrons.
An electric current involves the flow of electrically charged particles - usually electrons, but it may also be other particles, with a positive or negative charge. Now, to say that an electric current "is" a flow of charged particles is an oversimplification - the situation is a bit more complicate…d. (MORE)
Electric current flows through closed loops across which a voltage has been applied. For example, connecting the negative and positive terminals of a battery will cause current to flow. This is due to the chemical potentials of the respective terminals, which are a measure of their affinity for elec…trons. An interesting illustration of chemical potentials is the implementation of new battery technology. The chemical potential is a defined number for any substance. The bigger the difference between two chemical potentials in a battery, the greater the voltage that can be generated. Regular batteries use Zinc and Copper ions in separate chambers to create the chemical potentials. Newer batteries use exotic materials like Lithium ions that can generate more electricity per unit mass and are rechargeable, but are a bit more expensive. (MORE)
An electric current will flow if there is a voltage, and a conducting path (usually a closed circuit is required). An electric current will flow if there is a voltage, and a conducting path (usually a closed circuit is required). An electric current will flow if there is a voltage, and a conductin…g path (usually a closed circuit is required). An electric current will flow if there is a voltage, and a conducting path (usually a closed circuit is required). (MORE)
The flow of an electrical current be -- Coulombs per Second or Ampere hours per hour.
Electricity can flow in an electric circuit by a battery. The battery creates electrons, which flow through the wire, and then go into a light bulb. (That is how a light bulb in a circuit lights up.) A series circuit is a circuit with one wire that electrons can flow through. Also, there can be more… than one light bulb connecting to the same wire. A parallel circuit is a circuit with light bulbs that have their own wire. Clarification The above answer, unfortunately, perpetuates the myth that current leaves a battery, and finds its way around a circuit. This is not the case at all. It is the load that 'draws' the current from the battery and it is the load that determines the size of that current. (MORE)
Electrons Actually current is counter to the flow of electrons. The definition derives from Benjamin Franklin who knew that something was moving but didn't know if it was positive things or negative things. He had a 50/50 change and guessed the wrong one.
Curren flow from high potential to low potential or simply, positive pole to negetive pole.
In a conducting wire, an electrical current will flow at about 2/3 the speed of light in a vacuum, or 200,000 km/sec. Note that the speed of the individual electrons is quite a bit less, and the average speed of the electrons is less than a millimeter per second. It is the CURRENT that advances at 2…/3 the speed of light, not the electrons. Answer The free electrons in a metal conductor move in random directions at a very high speed -a little less than the speed of light. This is the case whether or not a potential difference (or an electric field) is applied across the ends of that conductor. However, when a potential difference is applied, these randomly-moving electrons are slightly biased towards the positive end of the conductor. So if a randomly moving but unbiased electron would normally end up at, say, point A, within the conductor then, under an electric field, it would end up at point B instead -where point B is typically less than the diameter of an atom away from point A. So individual electrons move along a conductor at speeds in the order of millimetres per hour. As current is defined as a drift of electric charge (free electrons, in the case of metal conductors), this means that the velocity of this drift and, therefore, an electric current is very, v-e-r-y, slow! However, the effect of that current is felt immediately along the whole length of that conductor in much the same way that a number of railway wagons respond, practically instantaneously, to a small movement of just one of those wagons. Electric current is so slow that, in practical terms, it's unlikely that an individual electron will complete its journey through the filament of a flashlight within the lifetime of its battery! (MORE)
In conventional current, current moves from positive to negative. In electron current, current moves from negative to positive.
To be precise, a current doesn't flow - a current "is". Although many people - including myself - often use the informal term "a current flows". The particles that make up the current do flow - or move. An electrical current involves the movement of some type of charged particles. Often, these are… negative electrons, but there are other possibilities, as well, especially positive holes, and negative or positive ions. (MORE)
It moves to the next atom. the valence electrons bounce from one atom to the next, if I remember correctly
A: Electrons move at the same speed no matter how long is the cable but some will not shows up at the end because of impedance
There are many complex explanations for current flow in electronics. The answer below describes the basic requirements without including great detail. For a more academic discussion, you are advised to look at relevant sections of text books on electrical and electronic engineering. In order for e…lectrical current to flow, there must be two things: 1) A voltage (sometimes referred to as a "potential difference"). The voltage can be created by a battery, a generator, a solar cell or a mains voltage outlet. 2) A complete circuit. This must include conductors such as wires that start at the positive terminal of the voltage source and at the far end, return to the negative terminal of the voltage source. Other components such as lamps, resistors and switches can form part of the complete circuit. We must have a voltage for current to flow because without it, there is no "electrical force" to cause the current to flow. We need a complete circuit so that the current can flow from the positive of the voltage source, through conductors and return to the negative of the voltage source. Current will flow through any complete circuit. If a switch is part of the circuit, when it is open, no current can flow because the circuit has been broken. When the switch is closed, the circuit is complete and current will flow once again. Therefore, it is possible to have a voltage without a current (switch open, for example) but it is not possible to have a current without a voltage. NB: Mains electricity is alternating current. It follows the same principles as the DC examples mentioned above although there is a changing voltage rather than a constant voltage. (MORE)
When a current flows through a conductor, electrons flow opposite the direction of the current. They are opposite because scientists picked the positive direction of current flow before the electron was discovered.
The individual electrons will move back and forth, as they do when there is no current. You would have to do very careful statistics to notice that there are slightly more electrons moving in one direction than in the other: the drift velocity (average velocity due to current) of the electrons is ty…pically a fraction of a millimeter per second. (MORE)
You can change current by altering potential difference or resistance... But assuming the voltage is constant, the resistance of the circuit restricts the flow of electrical current.
Electricity will always flow from the positive to the negative side of a battery or other power source as the excessive ?-trons try to move to the needy - side.
The potential difference between two point causes the electrons of the conducting medium to be attracted towards the positive ends and hence the currents flows from the positive end to the negative end
Electric current is made to flow in a wire by applying a presure of extra electrons at one end of the wire .. this excites the atoms in the wire and that excitement is transfered to the other end of the wire along the way the excitement is displayed as light, heat, or magnetism used to turn motors
An open circuit, it can be deliberate like a switch or accidental, like a blown fuse.
An insulator stops the flow of an electric current because it doesnot conduct electricity. The conductivity of a substance depends on the electrons in orbitin its atoms. In copper you have only one electron in itsouter-most orbit making is more conductive. If memory serves,aluminum has 2 electrons …in its outer-most orbit. Non-conductive orinsulation materials have more electrons in their outer-most orbitsmaking them more stable and less conductive. Another Answer An insulator doesn't really 'stop the flow of current', it's moreaccurate to say that it cannot support the flow of current. This isbecause, compared with conductors, insulators have relatively-fewcharge carriers available to enable them to conduct. (MORE)
No a pencil is made of wood, graphite, and rubber, which are all insulators, however the aluminum part surrounding the eraser could conduct electricity
An electric current flowing through a long conductor has electronsmoving end to end, uniformly pushing one ahead of the other. Thestarting and stopping of flow of electrons from end to end isessentially instant.
The device used for this purpose is called a disconnect switch. By opening and closing the electrical switch, it stops and starts the current flowing in an electrical circuit.
That means how quickly charges go past a certain point. If a wire has a current of 1 A, that means that at any point of the wire, a charge of 1 C / second will flow past.
Important note If insulators are allowed to get wet, the water on their surfaces can easily destroy the insulation effect. For that reason design engineers must take adequate precautions to prevent an insulator from getting damp or wet. Examples: double-insulated household appliances and electr…ical apparatus that is enclosed by watertight protective boxes for vehicles, boats, aircraft, etc. If an insulator cannot be prevented from getting damp or wet, the operating conditions must be so arranged that the water is not subjected to a high enough voltage to make the water conduct. Examples: high-voltage electricity power lines, which are open to the weather (rain, snow, etc.) are carried by ceramic insulators which have long surface lengths. The length of the insulators is designed to match the voltage of the lines so that any water on their surfaces won't cause catastrophic short circuits of current to the grounded towers which support the insulators. Insulators such as dry wood, plastic and rubber resist the flow of electricity. (MORE)
Electricity will flow if there is a conductor (a material that conducts electricity), and a voltage. The conductor should form a closed circuit. To have a more or less permanent voltage requires a source of energy, such as a battery, or a connection to household current.
Some examples of materials that don't allow the flow of electrical current: Glass, wood, plastic, rubber, ebonite, paper, ceramic.
There are two possible causes: 1. The circuit has no Voltage applied to it. 2. The resistance of the circuit is INFINITE.
Electric current is a flow of charge carriers. Usually thesecarriers are electrons. However, they may also be ions, chargedmolecules, 'holes' in semiconductors, and so on.
If a voltage is applied, electrons (or other charge carriers) are subjected to an attraction towards one side, and a repulsion from the opposite side. This results in the current, i.e., the flow of charge carriers.
how does electric current flow in the b connection? do the two bulbs in a series circuit, light when the middle bulb isloose? why?