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what current goes back and forth, or oscillates, rather than traveling in only one direction

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βˆ™ 15y ago
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βˆ™ 12y ago

alternating currents

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βˆ™ 13y ago

AC

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Q: What kind of current goes back and forth or oscillates rather than traveling in only one direction?
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Current that cycles back and forth rather than traveling in only one direction?

altertnating currents


What current model shows electrons traveling in specific energy levels around a nucleus of protons and neutrons?

Your question is not entirely correct; the current model does not show electrons traveling around a nucleus, but rather, surrounding a nucleus in the form of a cloud. Traveling electrons would necessarily emit photons and lose energy, and would therefore spiral into the nucleus. The current model is quantum mechanics.


Why current density is vector quantity?

Current is not scalar. Current is a vector quantity. For simplicity, in electric circuits, current is scalar because the direction is assumed to be one way or another, rather than three dimensional.


What allows current to flow in one direction?

A diode is one of the fundamental building blocks of electronics. They allow the flow of electrons in one direction only. Thus are commonly used as rectifiers to turn ac voltages into dc. [A dry cell (mistakenly called a battery, which is a group of cells) will allow electron flow in one direction only, or rather, it will provide current flow in one direction. ]


What is alternated current?

That refers to a current in which the direction of flow changes continuously. In household current, this usually happens at 50 or 60 cycles per second (depending on the country), but the definition of alternating current can include just about any other frequency, as well.


Suppose that you're facing a straight current-carrying conductor and the current is flowing toward you the lines of magnetic force at any point in the magnetic field will act in?

The lines of magnetic force at any point in the magnetic field of a current flowing towards you will act in the counter clockwise direction. This can be determined by using the right hand rule. Point your thumb in the direction of the current flowing down the straight wire. The curl of your fingers shows the direction of the magnetic lines of flux. The magnetic field of a current is always perpendicular to it. A current facing away from you would produce magnetic lines of force acting in the clockwise direction.


Energy carried by current?

For DC: power (in watts) = current (in ampere) x voltage (in volts). Energy = power x time, so energy = current x voltage x time (time in seconds). For AC, a power factor may have to be included (the cosine of the angular displacement between current and voltage). This is often near one, but it may be less.


Why there is no current established in a conductor in the absence of electric field although a large number of free electron are moving with high speed?

There can be a large number of free electrons moving at a high speed, with no net current, if the electrons are all moving at random. Random motions are a form a heat, rather than current. You only have a current when significant numbers of electrons are moving in the same direction.


What is the deference between Alternate current and direct current?

Direct current runs in one direction. Alternating current actually changes direction at a rate of 60 cycles (called Hertz, or Hz) a second in the United States and 50 cycles in Europe. A cycle is once in each direction. It's hard to imagine an object changing directions 120 times a second but this is what happens. We still talk of AC as flowing to a load in one wire and returning in another, which is what DC really does. And in your home or office this simplifies a rather complicated process. But in reality the electrons never flow that far before they turn around a go back the other way.


What is maximum current given to 8 ohm speaker?

A: is not current or voltage but rather the product that is of concern


Electric current is a flow of charge why two wires rather a single is required?

If the current flows only in one direction, it will flow for a very short time - due to the electric charge that builds up. For example excess electrons will build up on one side, and stop any further electrons from coming in.


Is voltage a vector?

Yes, although we call it a phasor, rather than a vector. This is because voltage has displacement, rather than direction.