Electromagnets are intriguing devices that create a magnetic field using electricity and do not always exhibit magnetic properties. These types of magnets function by running a current from some source of electricity through a wire. This simple process can create a magnetic field around another coiled wire, which causes the electromagnet to exhibit the desired behavior and properties as though it has been magnetized.Continue Reading
Electromagnets are unique because they have the ability to be turned on and off. This is done by breaking or completing the circuit that gives the electromagnet its magnetic properties. For this reason, they are often used in different industrial settings that require the movement of large metal objects, such as junkyards.
Electromagnets use a very simple property: tightly coiled wire around a piece of metal that creates a magnetic field if exposed to a current. Usually, the wire wrapped around this metal is copper. By themselves, these parts do not exhibit magnetic properties. However, once they have been introduced to a source of energy, usually from a battery, the magnetic properties activate fully. As long as there is a flow of current running through the wire, it will continue to maintain an electromagnetic field.Learn more about Magnetism
A compass always points north because Earth's iron core creates a magnetic field that attracts the compass needle to the North Pole. However, a compass doesn't point directly to the North Pole; Earth's magnetic field is a little offset. This deviation from true north is called declination.Full Answer >
The asymmetric shape of the atoms of piezoelectric crystals creates positive and negative poles sensitive to electricity and deformation. This causes the crystal to produce a small voltage when it is vibrated or when enough pressure is applied to change the shape of the crystal. This effect is reversible; when an electric voltage is applied, the crystal changes shape by a small amount.Full Answer >
The Tesla oscillator was a reciprocating steam-powered electricity generator. Steam was forced into the oscillator and exited through a series of ports pushing a piston up and down at great speeds. The piston was attached to an armature that vibrated and could be attached to a generator and was used to create electricity. The device was patented by Nikola Tesla in 1893.Full Answer >
A nail that is used in an electricity experiment with wire coiled around it is an example of a temporary magnet. When the electrical current is on, it acts as a magnet, but when it's off, it is no longer magnetic.Full Answer >