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bigmack
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Induced Voltage = -NBA/t
I know the equation, but could someone please explain it to me?
I know the equation, but could someone please explain it to me?
"A" is the area of the coil.bigmack said:hmm that looks good, but how do you get "A" ?
Read about Lenz's law at the bottom of that same page.oh and why is there a negative sign?
Using a bit of geometry. For a circular coil, the area is [itex]\pi r^2[/itex].bigmack said:but how do you find the area of the coil?
What you really want is: Induced Voltage = -N Δ(BA)/Δt, where Δ(BA)/Δt is the rate of change of the magnetic flux (BA). (Read the explanation on the website I linked.)bigmack said:to calculate the induced voltage, you check the area of the field, you multiply it with the strength of the magnet, divide by the speed of the wire and multiply by the number of turns of the wire.
Yes, the magnetic field has units of Tesla. Area has units of meters²; time has units of seconds.wait, what are the units?
B is in Tesla, right? but what about A and t ?
bigmack said:Induced Voltage = -NBA/t
I know the equation, but could someone please explain it to me?
Doc Al said:What you really want is: Induced Voltage = -N Δ(BA)/Δt, where Δ(BA)/Δt is the rate of change of the magnetic flux (BA). (Read the explanation on the website I linked.)
Yes, the magnetic field has units of Tesla. Area has units of meters²; time has units of seconds.
arunma said:I'm not sure I understand the question. The induced emf on a coil of wire depends on the wire's shape, the rotation speed, the time dependence of the magnetic fields, and other specifics of the problem. The usual example is a coil of circular wire spinning in a constant magnetic field, in which case the induced voltage is,
[tex]emf = \omega NBA cos\left(\omega t\right)[/tex]
The equation you gave says that the induced emf will decay over time, tending to zero. What's the physical situation here?
That's not a simple problem. You need to know the rate at which the magnetic flux through your coil is changing at any given time. That will allow you to find the induced voltage at that moment using Faraday's law.bigmack said:ok.
im trying to generate current by cutting magnetic fields with wiring coiled around an iron core.
all i want to know is how much current I am going to get and the voltage too.
Induced voltage refers to the voltage that is created in a conductor when it is exposed to a changing magnetic field. The NBA/t equation is used to calculate the magnitude of the induced voltage, where N is the number of turns in the conductor, B is the strength of the magnetic field, A is the area of the conductor, and t is the time it is exposed to the magnetic field.
Induced voltage occurs when a conductor, such as a wire, is moved through a magnetic field or when a magnetic field is changed near a conductor. This movement or change in the magnetic field causes a change in the flux through the conductor, which in turn creates an induced voltage.
The magnitude of induced voltage is affected by the strength of the magnetic field, the speed of the conductor through the field, the angle between the magnetic field and the conductor, and the number of turns in the conductor. A larger magnetic field, faster movement, and more turns will result in a higher induced voltage.
Induced voltage has many practical applications, including power generation in electric generators, transformers used in power distribution, and inductive charging for electronic devices. It is also used in many industrial and scientific processes, such as electromagnetic forming and induction heating.
Induced voltage can be harmful if it is strong enough to cause electric shock or damage to electronic devices. However, most devices are designed to handle a certain level of induced voltage. It is important to properly ground and shield sensitive equipment to protect against induced voltage.