Greatest Inventions
$500
Generators
A electric motor is a device for transforming electrical energy into mechanical energy; an electric generator does the reverse, using mechanical energy to generate electricity. At the heart of both motors and generators is a wire coil in a magnetic field.
Transformers
In a standard transformer, the two coils are usually wrapped around the same iron core, ensuring that the magnetic flux is the same through both coils.
Electric cooker
Current flows through the wire in the center of the resistance element, where the electrical energy is turned into heat. The heat is conducted through the insulator that surrounds the resistance element, into the metal jacket, then to the surrounding air.
Compass
A compass works by detecting the Earth’s natural magnetic fields. The Earth has an iron core that is part liquid and part solid crystal due to gravitational pressure. It is believed that movement in the liquid outer core is what produces the Earth’s magnetic field.
Credit Card
The black strip on the back of the credit card is magnetic. This magnetic strip is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle of the magnetic strip is like a tiny bar magnet. The data is put on the magnetic strip by magnetizing the north and south poles on each of the tiny magnetic particles Price Varies!
Microphone
When the diaphragm vibrates, it causes other components in the microphone to vibrate. These vibrations are converted into an electrical current which becomes the audio signal $69.99!