This weeks focus: Magnetism & Electomagnetism
The Electric Motor
Electric motors: These motors work by using electromagnets to generate a strong magnetic field around smaller magnets which in effect causes the smaller magnets located on a nearby rotor to turn. The faster the smaller magnets turn, the faster the electric motor can run which will create a bigger electric field. this induction can be used to power household appliances, generators, hand-held tools and many more every day items.
In1821 Michael Faraday was the first to come up with the concept of the simple DC motor.The first DC motor was invented by William Sturgeon in 1832, and In 1888 Nicolai Tesla invented the AC induction motor.
NOW ONLY $175 Was $225
The Computer Monitor
Computer Monitors: Use electromagnets which give off light to create a picture this is done by beams of electrons moving at high speeds through electromagnets which divert the electron beams to create images.
The first CRT monitor was created in 1987 by a German physicist named Karl Ferdinand who also contributed to the development of the radio and television technology.
The Magnetic Door Lock
Magnetic Door Locks: These locks work by connecting an electromagnet to the door frame and a metal plate to the exterior of the electromagnet on the other side of the door frame. When the electromagnet is activated, the door is held firmly in place. When the current to the electromagnet is disrupted, the door can be easily opened. This is much faster than using a key to open and re-lock a door.
ONLY$200 Was $225
Toaster: Use electromagnets to create heat to toast the bread and sends an electric force that sends a signal the toaster when to stop toasting and release the coils holding the bread in place.
Charles Strite was a American inventor who designed the first ever pop up toaster. It had heating elements that could toast both sides of the bread at the same time. A clockwork timer turned off the electricity and at the same time released a spring which ejected the toast. In 1919 Charles Strite applied for a patent for the first automatic pop up toaster
The Cell Phone
The Cell Phone: Uses radio frequencies which is a form of electromagnetic energy.
Martin Cooper is a pioneer and an innovator in radio spectrum management
While at Motorola in the 1970s, Cooper conceived the first handheld mobile phone and led the team that developed it. He is considered the "father of the cell phone".
ONLY $30 Was $60
The Electromagnet Magnet
The Electromagnetic magnet: This works by applying electricity to the magnet. Electricity is pushed into the magnet through coiled wire around the magnet's core creating a strong magnet force. When there is more electricity the magnetic field will be stronger.
The electromagnet was developed by several people. In 1820 Hans Christian Oersted discovered that a current-carrying wire set up a magnetic field. In the same year, André-Marie Ampère discovered that a helix of wire acted like a permanent magnet, and Dominique François Jean Arago found that an iron or steel bar could be magnetized by putting it inside the helix of current-carrying wire. Finally, William Sturgeon found that leaving the iron inside the coil increased the magnetic field. he then also bent the iron core into a U-shape to bring the poles closer together to concentrate the magnetic field.
The Generator: this uses an induction motor which works by sending a rotating magnetic field sideways through the walls of a copper cylinder, the field will then cut the copper generating a current in it, and also a powerful magnetic field, and the magnetic field in the copper repels the rotating field. This pushes the copper forward making the copper try to move.
The T.V. : The CRT televisions use electromagnets to control the motion of the electron beam in the tube. The electron beam is what moves across the back of the screen and causes phosphor dots to glow, which generates the picture. The electromagnets are placed around the tube to control how the beam moves from side to side and from top to bottom.
The first cathode ray tube scanning device was invented by a German scientist named Karl Ferdinand in 1987. He introduced a CRT with a fluorescent screen, known as the cathode ray oscilloscope. The screen would emit a visible light when struck by a beam of electrons.
Electromagnets have been used in radio, specifically used in speakers and the conversion of sound to radio signals and back again, speakers are nothing more than a fine-tuned electromagnet. The coil and tube are then placed in a magnetic field. As the magnetic field changes, it puts pressure on the coil of wire and on the tube, causing them to move within the field. This creates sound, which is then amplified through the cone and out of the speaker in the radio.
Gugliegmo Marconi was an Italian inventor, and was first credited with the invention of the radio, but he was later proven to have used 17 of Nikola Tesla's patents. In 1943, the radio patent by a vote by the United States Congress was reversed and given to Nikola Tesla. Nikola Tesla invented the fundamentals for the radio transmission before Marconi even thought of it.
ONLY $ 450 Was $550
The speaker: this uses a coil of wire that is electrically attached to a amplifier. The coil is the electromagnet not the magnet itself.The magnet has a permanent magnetic polarity that does not change. When the coil of wire is placed inside the magnet assembly "pole piece" and an alternating signal is placed thru the coil it will cause the coil to oscillate as the coil will now attract and repel within the magnet assembly as the polarity changes on the coil.
Was first developed in the 1920's