Year 9, electromagnetic induction
This Year 9 practical demonstrates one of the most important discoveries: the induction of an electrical current by a moving magnetic field.
It was discovered by Michael Faraday in 1831.
When a magnetic field moves through a coil of wire, an electrical current is generated.
Similarly, when an electrical current flows through a coil, a magnetic field is generated. One begets the other!!
This extraordinary realisation that magnetic and electric fields were related changed the world forever.
It is the basis for transformers and electric motors used in everything from cars, to hairdryers, fans, fridges and air conditioners!
It is also what light is, and how it can travel through empty space!!!!!!
In this photo, on the right a magnetic field pushed through a coil pushes an electrical current through the ammeter.
On the left, a 9V battery is pushing an electrical current through another coil, creating a magnetic field which is repelled by the round magnet below, causing the coil to spin really fast!!
Here is a picture of a light wave which works in exactly the same way!!
In this photo, on the right a magnetic field pushed through a coil pushes an electrical current through the ammeter.
On the left, a 9V battery is pushing an electrical current through another coil, creating a magnetic field which is repelled by the round magnet below, causing the coil to spin really fast!!
Here is a picture of a light wave which works in exactly the same way!!
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