One of the main kinds of speakers needs both.
Sound in the form of varying electricity is fed through part of the speaker known as the 'voice coil' which is actually just an electromagnet. Since the electricity in it is varying the magnetism produced by this coil varies too. The voice coil is placed close to a permanent magnet and the voice coil is permitted to move back and forth in response to the electricity going through it. A big cone is fastened to the voice coil to transmit the movements of the voice coil to the air more efficiently. Thus overall the permanent magnet and the electromagnet work together to produce the sound waves that we hear from a speaker. For a more detailed explanation go to the How Stuff Works web site and search for speaker.
When you need a magnet you can turn on and off an electromagnet is used.
That's a permanent magnet. After all, the compass doesn't need an electrical current, right?That's a permanent magnet. After all, the compass doesn't need an electrical current, right?That's a permanent magnet. After all, the compass doesn't need an electrical current, right?That's a permanent magnet. After all, the compass doesn't need an electrical current, right?
An electromagnet is a circuit made of a power source and wires
Scrap Heap MagnetUsually the kind of magnet a junkyard uses is an electromagnet. An electromagnet is simply an iron core wrapped around by copper wire. Then current runs through the wire, it becomes a very strong magnet. There are other types, but I think electromagnet is the most common for car scrap heap.
The most basic of electric motors consists of a permanent magnet and an electromagnet. This is not a requirement for all types of electric motors and most modern electric motors do not have permanent magnets. The stator and rotor are the two active elements of a simple electric motor and both have magnetic fields in the various types and designs of simple motors.
When you need a magnet you can turn on and off an electromagnet is used.
That's a permanent magnet. After all, the compass doesn't need an electrical current, right?That's a permanent magnet. After all, the compass doesn't need an electrical current, right?That's a permanent magnet. After all, the compass doesn't need an electrical current, right?That's a permanent magnet. After all, the compass doesn't need an electrical current, right?
A magnet made from a steel paperclip is most likely a(n) temporary magnet.
an electromagnet is a magnet which is activated by electricity and it ceases to be a magnet once the electric supply is stopped whereas a magnet is a natural magnet which does not need electricity and continues to be a magnet whether it is supplied by electricity or not.
With an electromagnet, the magnetism can be turned on and off according to the whim or need of the operator.
A permanent magnet is always on; there isn't any way to turn it off. An electromagnet can be controlled; you can turn it on or off, or change the amount of magnetism by varying the current passing through the coils.
An electromagnet is only magnetic while current is flowing through the coils. A permanent magnet is always magnetic, and does not need electricity. An example of an electromagnet at work is in a metal scrape yard, where a large electromagnet is used by a crane operator to lift ferrous metals into a crusher (scrapped cars, for instance). The metal drops into the crusher when the electricity is switched off by the crane operator. Therefore, they are only really similar when both are magnetised.
no you just need something metal like an iron nail and wrap a coil of un-insulated wire around it and send a current through the wire.
An electromagnet is simply a device that will create a magnetic field when electricity is run through it (basically a normal magnet, but you need to plug it in). Depending on the magnetic charges of the electromagnet and the regular magnet, it should either attract or repulse like magnets normally do to one another.
Man-made permanent magnets are not so different from naturally-occurring magnets.In the case of a permanent magnet, electrical charges are irrelevant. The magnet may, or may not, have an electrical charge, but that doesn't affect the magnetism. An electromagnet works by electrical currents, which is a flow of charges. The electromagnet, however, doesn't need to have any net charge. In other words, any charge would go in at one point of the magnet but an equivalent charge would go back out at some other point.
You need to use an electromagnet in a scrap yard so that you can let go of the pieces of scrap that you pick up. A permanent magnet would not allow you to let go.
An electromagnet is a circuit made of a power source and wires