Bibliography
[1] http://www.gcsescience.com/pme5.htm
[2] http://www.s-cool.co.uk/a-level/physics/magnetic-fields/revise-it/effect-of-ferrous-cores-and-the-relationship-between-curre [3] http://www.bbc.co.uk/bitesize/ks3/science/energy_electricity_forces/magnets_electric_effects/revision/4/ [4] http://www.howmagnetswork.com/Electromagnetism.html
[5] http://www.wisegeek.com/what-is-a-solenoid-door-lock.htm [6] http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html
The shape of a magnetic field around a solenoid
http://www.gcsescience.com/pme5.htm
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How to strengthen a magnetic field around / in a solenoid
http://www.s-cool.co.uk/a-level/physics/magnetic-fields/revise-it/effect-of-ferrous-cores-and-the-relationship-between-curre Electromagnets all consists of a current carrying conductor, however the strength of the magnetic field produced also depends on the surrounding substance. Air is not particularly good at ‘carrying’ a magnetic field and so the field around a wire is quite weak. By placing a core inside of a coil the strength of the magnetic field can be increased.
By putting a ferrous (iron) core inside a solenoid, the field lines are concentrated. This has the effect of strengthening the field. Inside the core, the field lines are much closer together → stronger field. Iron is a particularly good core for solenoids as it is easily magnetised and demagnetised. This means that when the current is switched off the iron does not stay magnetic. Iron is said to be magnetically soft. http://www.bbc.co.uk/bitesize/ks3/science/energy_electricity_forces/magnets_electric_effects/revision/4/ Making an electromagnet stronger
The Essay on Cause And Effect Of Poverty In Tampa Fl
Cause and Effect of poverty in Tampa FL (1) Tampa is Floridas third largest city with population of 334.550. From year 2000 to year 2005, Tampas population has increased by 10%, because of this city is becoming increasingly attractive to the people who rely on social services, as the mean of obtaining income. Tampas subtropical climate and the fact that state of Florida provides various social ...
We can make an electromagnet stronger by doing these things: wrapping the coil around an iron core
adding more turns to the coil
Increasing the current flowing through the coil.
The magnetic field of an electromagnet
The 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.
Solenoids as magnets
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html
How a solenoid makes a magnet that can be switched on or off http://www.howmagnetswork.com/Electromagnetism.html
Solenoids
The solenoid is a long coil containing a large number of close turns of insulated copper wire. The magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a bar magnet.
The lines of magnetic force pass through the solenoid and return to the other end. If a current carrying solenoid is suspended freely, it comes to rest pointing North and South like a suspended magnetic needle. One end of the solenoid acts like a N-pole and the other end a S-pole. Since the current in each circular turn of the solenoid flows in the same direction, the magnetic field produced by each turn of the solenoid adds up, giving a strong resultant magnetic field inside the solenoid.
A solenoid is used for making electromagnets. The strength of magnetic field produced by a current carrying solenoid is: 1. Directly proportional to the number of turns in the solenoid 2. Directly proportional to the strength of current in the solenoid 3. Dependent on the nature of “core material” used in making the solenoid. The use of soft iron rod as core in a solenoid produces the strongest magnetism.
The Essay on Automated Door Lock System with Camera Integration
Security is a prime concern in our day-today life. Everyone wants to be as secure as possible. Security is the degree of protection against danger, damage, loss, and crime. Security as a form of protection is structures and processes that provide or improve security as a condition. Many people do not think about security at home until it is too late and they have become victims of burglar crimes. ...
How a solenoid can be used to secure a door
http://www.wisegeek.com/what-is-a-solenoid-door-lock.htm
A solenoid door lock is a remote door locking mechanism that latches or opens by means of an electromagnetic solenoid. In most cases, the actual locking mechanism of a solenoid door lock will be identical to a conventional key-operated example. The only difference between the two is the inclusion of a low-voltage solenoid in the mechanism, which pulls the latch back into the door when a push button or other controller is activated.
The latch will then be retained in the door for as long as the button is pushed, or, in the case of a latching solenoid, indefinitely until the button or controller is activated again. These types of door locks are used extensively in remote security access and automotive doors. As solenoids are much like electromagnets, they can be turned on and off.
The use of this is that a strong magnet could be used to keep a door shut but when a ‘key’ is activated, the current flowing to the solenoid is cut off, allowing the door to open. As the door is shut again, the circuit is closed/completed again and the magnet holds the door in place again. While the locking solenoid will keep the device locked, it is not technically on when in locking mode, because no power is being used.
The solenoid only needs power when unlocking and, because most devices are consistently locked, very little energy is ever required by the solenoid. For this reason, most solenoids run on battery power, and the battery rarely needs to be changed.
The majority of these solenoids are made to be small, because they fit in small devices, but there are some that are large and exhibit powerful electromagnetic forces. Heavy-duty solenoids are used in construction equipment, such as forklifts, to lock the mast when the machine is off or not operating. Unlike smaller solenoids that exhibit the force of about 45 Newtons, these larger solenoids use about 1,000 Newtons to lock the equipment in place.
The Essay on Door Lock Security Using Rfid and Face Recognition
In this class, I hope to achieve a lot of different things. I chose to take this class because it would help allow me to manage my time in a wise manner. I’m a senior in high school, and I’m doing this through the Running Start program. After I’ve graduated, I might take online classes, so I’m hoping that this will give me an idea of what that would be like. I have a lot of activities that I’m ...
When a door or device locks via a solenoid, it is using basic electromagnetic forces to control the lock. The solenoid fits in the locking mechanism and, when locked, will expand so the device cannot be unlocked by sheer force. An electromagnetic force, such as a keycard, is needed to tell the solenoid to move, allowing the device to unlock and open. Convert:
http://www.digitaldutch.com/unitconverter/force.htm
45 newton’s=4.588723 kilograms force. This means 4.588723 kg is applied to keep the door shut. This relatively low locking force is actually rather
