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How does turning off the current in a industrial electromagnet affect its magnetic field?
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Why does a crane use an electromagnet instead of a permanent magnet?
So that the load can be dropped by turning off the current.
How you can demagnetize materials?
A magnet has magnetic properties because the dipoles of the atoms are lined up in a single direction. To demagnetize it, you must scramble the dipoles out of alignment. First, heat the magnet past the Curie point (the temperature at which it loses its magnetic properties until cooled). Strike it on the ends of the magnet with a hammer. When cooled, it will no longer be magnetized.
What forms of electricity are caused by turning wire inside a magnet?
Rather than turning the wire, it needs to move through a magnetic field. Unless the magnet has infinite length, it will need to come back again, or form part of a coil, which turns within the field. I think the answer you are looking for is AC, (Alternating Current). This is because as the coil turns inside the magnetic field, it first cuts the field one way and then the other as part of its rotation. The direction of the current will also flow one way and then back the other. AC.
Why generator produces only AC?
A generator produces electricity by moving wires through a magnetic field. The direction of the induced current is dependent upon the direction in which the wire crosses the magnetic field. In a generator the magnetic field is usually fixed - and the wires are spinning through it. So: Visualize a horizontal magnetic field. The axis of rotation of the wires is perpendicular to the field. Any given wire will be cutting up through the field at a given point... then, 180º later will be cutting down through the same field. The direction of the induced current will reverse with each half-rotation because the wire will be moving in the opposite direction relative to the magnetic field. (In the USA the generators produce "60 cycle" current. That tells you that the generators are turning their wires (coils) at 60 revolutions per second.) Richard yeaa buddie...Lickety splyt
What determines the rate of energy delivered by current?
In a simple circuit, the amount of voltage, and the resistance of the load. Amps = volts / ohms. For a motor, the back EMF when the rotor is turning reduces the effective voltage across the windings, reducing the current. That is why a motor may burn out if it is powered but cannot turn.
How can the magnetic field strength of an electromagnet be reduced?
Either increasing the size of the current (in amps) or the number of turns of wire wrapped around the core will make a stronger magnet. A larger current will make a stronger magnet (up until too much makes the wire melt!). Increasing the voltage forces more current through the electromagnet.
Changing magnetic field produces a electric current?
I think it is the other way round and that an electric current produces a magnetic field.This is copied from KS3 bitsize:Magnets and electric current - ElectromagnetsWhen an electric current flows in a wire it creates a magnetic field around the wire.By winding the wire into a coil we can strengthen the magnetic field. Electromagnets are made from coils like this.Making an electromagnet strongerWe can make an electromagnet stronger by doing these things: wrapping the coil around an iron coreadding more turns to the coilincreasing the current flowing through the coil.The magnetic field of an electromagnetThe magnetic field around an electromagnet is just the same as the one around a bar magnet. It can, however, be reversed by turning the battery around. Unlike bar magnets, which are permanent magnets, the magnetism of electromagnets can be turned on and off just by closing or opening the switch.
Why does a crane use an electromagnet instead of a permanent magnet?
So that the load can be dropped by turning off the current.
What do scrap heap magnets repel?
The strength of any electromagnet changes when the current (amperes) or the number of 'turns' of wire in its wire coil changes. Increasing either of them makes the magnet stronger.
What occurs when an electric current is made by a changing magnetic field?
We might call it induction, magnetic induction, or electromagnetic induction, depending on what kind of setup we were inspecting. It is the phenomenon of induction that allows a moving magnetic field to cause (induce) current flow in a conductor. A link can be found below for more information.
What is a scrap yard magnet?
It is a magnet which moves metal around the scrap yard. Scientific explanation = It s a big round magnet which is actually an electromagnet. This allows the magnet to be turned on then off. When turned on the electromagnet attracts any magnetic substances. This is why most cars are made of something magnetic! You can move this electromagnet around because it is a crane you pick stuff up move it and then drop it by turning the electromagnet off!
Why the field current is less in generator?
The field current is used to create an electromagnet. The power out of a generator comes from the prime mover (the thing that is making the rotor spin), not the field current. The field current is necessary to set up an electric field to induce electric current onto the stator windings. The stronger the electromagnet, the harder it is for the prime mover to spin (similar to a high gear on a bicycle), causing more power to be needed to keep the prime mover turning.
How can you turn off an electromagnet?
An electromagnet requires electric power to be a magnet. You turn it off the same way you turn off a light, by turning the switch.
What does the switch do to the electro magnet?
The switch is turned on to activate the electromagnet, and metal is attracted. Turning off the switch stops the electromagnet from working, and metal is no longer attracted.
What is Generalization explain?
A generator is tool that converts kinetic energy into electricity, through the use of magnets which is surrounded by magnetic fields. As a magnet starts turning its magnetic fields collide with a coil that surrounds the magnet. Which induces current, which is electricity.
What is generator brief explain?
A generator is tool that converts kinetic energy into electricity, through the use of magnets which is surrounded by magnetic fields. As a magnet starts turning its magnetic fields collide with a coil that surrounds the magnet. Which induces current, which is electricity.
How can turning on the electricity allow the iron crane to pick up the car?
Connecting the electricity will activate the electromagnet.
