# data[].attributes.body
“Electromagnets in Daily Life.” Electromagnets in Daily Life - Home, electromagnets.weebly.com/index.html. Accessed 26 Apr. 2017.

# data[].attributes.body
“Study.com.” Study.com, Study.com, study.com/academy/lesson/what-is-an-electromagnet-definition-uses-parts.html. Accessed 26 Apr. 2017.

# data[].attributes.body
“Electromagnet.” Wikipedia, Wikimedia Foundation, 26 Apr. 2017, en.wikipedia.org/wiki/Electromagnet. Accessed 26 Apr. 2017.

# data[].attributes.body
“Examples of Electromagnetism in Modern Technology.” Brighthub Engineering, 24 May 2011, www.brighthubengineering.com/consumer-appliances-electronics/72138-examples-of-electromagnetism-in-todays-technology/. Accessed 26 Apr. 2017.

# data[].attributes.body
A solenoid valve is an electromechanically operated valve. The valve is controlled by an electric current through a solenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.

Solenoid valves are the most frequently used control elements in fluidics. Their tasks are to shut off, release, dose, distribute or mix fluids. They are found in many application areas. Solenoids offer fast and safe switching, high reliability, long service life, good medium compatibility of the materials used, low control power and compact design.

# data[].attributes.body
A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations.

A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching.

Magnetic latching relays require one pulse of coil power to move their contacts in one direction, and another, redirected pulse to move them back. Repeated pulses from the same input have no effect. Magnetic latching relays are useful in applications where interrupted power should not be able to transition the contacts.

Magnetic latching relays can have either single or dual coils. On a single coil device, the relay will operate in one direction when power is applied with one polarity, and will reset when the polarity is reversed. On a dual coil device, when polarized voltage is applied to the reset coil the contacts will transition. AC controlled magnetic latch relays have single coils that employ steering diodes to differentiate between operate and reset commands.

# data[].attributes.body
All industrial lifting magnets are electromagnets. From the outside, you see only a heavy cast or machined steel casing and a cover plate. Inside is a carefully fabricated winding of aluminum or copper electrical conductor. Each layer of the winding is separated by a thin layer of insulation. The inside of the casing is also coated with insulation. The cover plate is a sheet of manganese, providing an extremely hard, non-magnetic protective shield for the coils. The final component is a cable carrying 230 volts of DC current.

# data[].attributes.body
The Cyclotron is a device used to accelerate charged particles to high energies.

A Cyclotron works on the principle that a charged particle moving normal to a magnetic field experiences magnetic Lorentz force due to which the particle moves in a circular path.
Construction:
It consists of hollow metal cylinder divided into two sections D1 and D2 called dees, which are enclosed in an evacuated chamber. Thes perform the function of electromagnetism; they are provided with a continuous AC supply where the dees continuously change their polarity depending upon the frequency of the AC supply.

The dees are kept separated and source of ions is placed at the center in the gap between the dees. They are then placed between the pole pieces of a strong electromagnet. The magnetic field is perpendicular to the plane of the dees, and the dees are connected to a high frequency oscillator.

# data[].attributes.body
Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of an electromagnet, and an electronic oscillator that passes a high-frequency alternating current (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. In ferromagnetic materials like iron, heat may also be generated by magnetic hysteresis losses. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth.

# data[].attributes.body
An electromagnetic lock, magnetic lock, or maglock is a locking device that consists of an electromagnet and an armature plate. There are two main types of electric locking devices. Locking devices can be either "fail safe" or "fail secure". A fail-secure locking device remains locked when power is lost. Direct pull electromagnetic locks are inherently fail-safe. Typically the electromagnet portion of the lock is attached to the door frame and a mating armature plate is attached to the door. The two components are in contact when the door is closed. When the electromagnet is energized, a current passing through the electromagnet creates a magnetic flux that causes the armature plate to attract to the electromagnet, creating a locking action. Because the mating area of the electromagnet and armature is relatively large, the force created by the magnetic flux is strong enough to keep the door locked even under stress.

# data[].attributes.body
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. A varying current in one coil of the transformer produces a varying magnetic field, which in turn induces a voltage in a second coil. Power can be transferred between the two coils through the magnetic field, without a metallic connection between the two circuits. Faraday's law of induction discovered in 1831 described this effect. Transformers are used to increase or decrease the alternating voltages in electric power applications.
Transformers have become essential for the transmission, distribution, and utilization of alternating current electrical energy.

# data[].attributes.body
Magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. This separation technique can be useful in mining iron as it is attracted to a magnet. In this machine, the raw ore, after calcination was fed onto a moving belt which passed underneath two pairs of electromagnets under which further belts ran at right angles to the feed belt. The first pair of balls was weakly magnetized and served to draw off any iron ore present. The second pair were strongly magnetized and attracted the wolframite, which is weakly magnetic. It is also used in electromagnetic cranes that separate magnetic material from scrap

# data[].attributes.body
Are modern trains that leverage electromagnet. Mostly founded in airports or other parts of the country. All Maglev trains rely on the attraction and repulsion of magnetic poles.  This repels the magnets on the bottom of the train, causing it to float. Once the train is floating, the tracks uses a different system for forward motion. The coils are supplied with an alternating current (AC), which causes the coils to switch polarity. By spacing the coils with gaps, the train's magnets are first attracted to the magnets in front but later repelled by them as the train passes over.

# data[].attributes.body
A doorbell revolves around a circuit consisting of an electromagnet, a metal arm, and a metal piece inside.

It triggers some kind of noise when you press the button of a doorbell, you are completing the bell's circuit, which is activating the electromagnet.

# data[].attributes.body
Magnetic resonance imaging (MRI) is a medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body in both health and disease. MRI scanners use strong magnetic fields, radio waves, and field gradients to generate images of the organs in the body.

# data[].attributes.body
In electricity generation, a generator is a device that converts mechanical energy to electrical energy for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines and even hand cranks. The first electromagnetic generator, the Faraday disk, was built by Michael Faraday. Generators provide nearly all of the power for electric power grids.

# data[].attributes.body
Motors use field coils which act as an electromagnet when a current is provided. These field coils in large motors then becomes the source of the magnetic field inside the motor.

# data[].attributes.body
TVs, cellphones, headphones, radios, and computers all use different types of speakers.

It takes an electric signal and transforms it into sound waves that humans can hear. The three main parts of the speaker is the diaphragm, the voice coil, and the magnet.

The diaphragm is the cone shaped structure. The cone is a flexible sheet of paper, metal, or plastic attached to the wide end of the diaphragm. The suspension which is a flexible rim that allows the cone to move. It in turn is attached to the frame of the diaphragm. The narrow end of the diaphragm is attached to the the voice coil by the spider.

The voice coil is the electromagnetic part of the speaker. The voice coil is a tight coil of wire hooked up the the speaker's power source. Alternating current electricity is run through the voice coil, causing it to constantly switch polarity.

The magnet is a permanent magnet that sits beneath the voice coil. The side that is facing the voice coil has one unchanging pole. Since the voice coil keeps changing polarity, it is constantly being attracted to and repelled from the magnet.

The voice coil's back and forth movement causes the diaphragm to vibrate. This vibration translates electrical signals into sound waves which humans can perceive.

# data[].attributes.body
Hard drives use magnetic recording to store information like a cassette tape.

The hard drive consists of the platter and the actuator.

The actuator arm, the piece that writes the data, magnetizes certain parts of the platter. To read the data, the arm goes back over the data and interprets these magnetized areas.