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What advantages are there in being able to turn an electromagnet on and off?
Wiki User
∙ 17y ago
Being able to turn electromagnets on and off is what separates them from normal magnets. EX: I recently dismantled a very small remote control car for the battery because it stopped working properly. The front wheels used electromagnets to pull the wheels left or right, a small motor would most likely be too heavy and/or use too much power. EX: In moving pieces in electronics: if it were a normal magnet, it could possibly damage other objects inside of the electronic. EX: Generators. Yes, I said generators. As in, electrical generators. Most rotation-driven electrical generators use magnets -- Something I don't particularly want to explain right now. But anyways, the magnets are a key part in generating electricity. So, if a wire breaks and there's no great way to stop the rotation quickly, just pull the plug on the electromagnets in it and no more juice gets fed into whatever the wire's broken onto, whether it's a person's car, or a nuclear bomb storage area. EX: One of the more commonly known, junkyard cranes! They need some way to release the cars, don't they? Might as well just drop it smack on the ground, it's already in a junkyard anyways. Also wouldn't require people to hook/unhook things. There are probably millions of ways they can be used, you just have to think for a little while.
Wiki User
∙ 17y ago
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How can you make a electromagnet lose its magnetism?
by decreasing its current,by decreasing turns of coil
How are electro magnets different from other magnets?
An electromagnet can be turned on and off, with an electric current and a magnet can not turn off
Is not a permanent magnet?
An electromagnet is a magnet while an electric current is running through the coil. Turn off the current and it is no longer magnetised, and is, therefore, not a permanent magnet.
What are the Disadvantages of complexity of organization of life?
advantages of complexity in organisms
How does the electric motor function?
An electromagnet is the basis of an electric motor. You can understand how things work in the motor by imagining the following scenario. Say that you created a simple electromagnet by wrapping 100 loops of wire around a nail and connecting it to a battery. The nail would become a magnet and have a north and south pole while the battery is connected.Now say that you take your nail electromagnet, run an axle through the middle of it and suspend it in the middle of a horseshoe magnet as shown in the figure below. If you were to attach a battery to the electromagnet so that the north end of the nail appeared as shown, the basic law of magnetism tells you what would happen: The north end of the electromagnet would be repelled from the north end of the horseshoe magnet and attracted to the south end of the horseshoe magnet. The south end of the electromagnet would be repelled in a similar way. The nail would move about half a turn and then stop in the position shown.You can see that this half-turn of motion is simply due to the way magnets naturally attract and repel one another. The key to an electric motor is to then go one step further so that, at the moment that this half-turn of motion completes, the field of the electromagnet flips. The flip causes the electromagnet to completeanother half-turn of motion. You flip the magnetic field just by changing the direction of the electrons flowing in the wire (you do that by flipping the battery over). If the field of the electromagnet were flipped at precisely the right moment at the end of each half-turn of motion, the electric motor would spin freely.
What advantages are there in being to turn a electromagnet on and of?
Being able to turn electromagnetic on and off is what separates it from a normal magnet.
How did eddison turn disadvantages into advantages?
Eddison did turn disadvantages into advantages by being positive and optimistic in life.
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.
How is electricity transformed into motion?
A motor transforms electricity. Inside the motor, there is a permanent magnet and an electromagnet, which can rotate. When the circuit is closed, the electromagnet is constantly repelled and attracted to the permanent magnet. This will cause the electromagnet to turn. It also causes anything that is attached to the electromagnet to turn, causing motion.
How do you turn off an electromagnet?
This is what makes a magnet an electromagnet - the ability to turn it on and off... Anyway, electromagnets can be turned off with either the help of a switch, or just by disconnecting the power supply.
When would you want to use an electromagnet rather than a permanent magnet?
When you need a magnet you can turn on and off an electromagnet is used.
What are two advantages of a electro magnet over natural magnet?
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.
How does an electromagnet turn on and off?
They turn on and off by taking the battery out and putting it back in or if it has a switch then you could use that.
What is an advantage of using an electromagnet over a permanent magnet?
The advantage of an elecromagnet is that you can turn it on and off with a simple switch. So for example if you want to pick up a scrap car with a crane/electromagnet and move it, you can turn the electromagnet off when you want to release the car. You could not do the with a permanent magnet obviously.
What is Medusa famuos for?
Being able to turn men to stone.
Electromagnet is a temporary magnet because you can?
turn it off by unplugging the current source.
Why would electromagnet be used in a recycling yard rather than a strong permanent magnet?
Because with an electromagnet, you can turn it off and on - you can pick things up with it then drop them again.
