P3.2.8 - P3.2.9 Electromagnetism 1 & 2 Flashcards
electromagnetic waves e.g. radiowaves can be detected by electrical equipment through…
aerials
Who discovered electromagnetic induction?
Michael Faraday
electromagnetic waves are sent from electrical devices via an instrument called a…
transmitter
When an electric current moves backwards and forwards (alternating current) they can generate…
waves e.g. radiowaves
What is peer review?
When scientists check each others work
This makes their findings more reliable.
A current that is constantly changing direction is called an…
alternating current
What is electromagnetism?
When a magnetic field is produced around a wire with a current flowing through it.
Wifi waves work at a different _________ to radiowaves
frequency
Who was the scientist that discovered electromagnetism?
Hans Christian Oersted
How can you increase the current generated by electromagnetic induction?
Use a stronger magnet
Increase the number of coils in the magnet
Increase the speed at which you move the magnet through the coil
Which type of electromagnetic wave is used in communications?
Radiowaves
How can you generate an electric current in a wire?
Coil the wire
Pass a magnet through the coil
There will be no current when the magnet is stationary
