ELECTROMAGNETIC INDUCTION
Rayna Wolfe Victoria Padilla pd.2
George Simon Ohm
As a high school teacher he began his research with the new electrochemical cell. Ohm found that there is a direct proportionality between the potential difference applied across a conductor and the resultant electric current. This relationship is known as ohms law.
Ohm's Law defines the interplay between electrical power, voltage, current and resistance.
Ohm examines the decrease in the electromagnetic force produced by a wire as the length of the wire increased.
Electromagnetic induction
One of the most widely is in electrical generators where mechanical power is used to move a mechanical field past coils of wire to generate voltage.
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. In fact, the same device can be used a motor or a generator.
When the device is used as a motor, a current is passed through the coil. The interaction of the magnetic field with the current causes the coil to spin. To use the device as a generator, the coil can be spun, including a current in the coil.
Electromagnetic Induction
This is a visual representation of electromagnetism.
Electromagnetic Induction experiment
An experiment involving electromagnetism.
Windmill
This is an example of electromagnetism in everyday life.
Ways that humans have used electromagnetism to improve life
Cell phone
cell phones emit signals via radio waves, which are comprised of radio-frequency (RF) energy, a form of electromagnetic radiation.
Microwave
Microwave technology is extensively used for point-to-point telecommunications. Microwaves are especially suitable for this use since they are more easily focused into narrow beams than radio waves.
Television
A beam of electrons is used to light up the phosphors on the screen. The direction of the beam is controlled by two electromagnets. One sweeps the beam horizontally while the other steps it down vertically.
Radio
Electromagnets are created when a copper wire is wrapped around either an iron core, or an air core (in which case it's called a solenoid), and a current is run through it. The electrical current creates a magnetic field that's identical to the one created by natural magnets.
Speakers
In order to translate an electrical signal into an audible sound, speakers contain an electromagnet: a metal coil which creates a magnetic field when an electric current flows through it.
Doorbell
An electro magnet pulls a pin towards a bell when the button is pushed and creates the sound.