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Transcript
How you can produce an electric current – Electromagnetic Induction Most of our electricity comes from huge generators in power stations. There are smaller generators in cars (=______________________, picture on the right) and on some bicycles (= _____________, picture on the left). But how is this electricity produced? When Michael Faraday made his discovery of electromagnetic induction in 1831, he stated that a changing magnetic field is necessary to induce a current in a nearby circuit. To test his hypothesis he made a coil by wrapping a paper cylinder with wire. He connected the coil to a voltmeter, and then moved a magnet back and forth inside the cylinder. Faraday-Experiment: Induction in A Coil What happens when you move the magnet back and forth inside the coil? _____________________________ What happens when you stop the motion of the magnet? _____________________________ By conducting this experiment Michael Faraday confirmed that a moving magnetic field is necessary in order for electromagnetic induction to occur. Name 3 items/conditions necessary for producing an electric current! _______________________ _______________________ _______________________ Think of 3 ways to increase the induced voltage and therefore the current! _____________________________________________________ What could be the reason for this induced current? – Remember that current only means “moving electrons”! ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________
