Download How you can produce an electric current

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!
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What could be the reason for this induced current? – Remember that current only
means “moving electrons”!
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