do now! can you read page 212 of your text book?
DESCRIPTION
The Motor Effect When a current is placed in a magnetic field it will experience a force (provided the current is not parallel to the field). This is called the motor effect. Can you copy this sentence into your books please.TRANSCRIPT
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Do now!
Can you read page 212 of your text book?
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Last lesson
• The motor effect and building a loudspeaker
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The Motor Effect
When a current is placed in a magnetic field it will experience a force (provided the current is not parallel to the field). This is called the motor effect.
Can you copy this sentence into your
books please.
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The Motor Effect
The direction of the force on a current in a magnetic field is given by Flemming’s left hand rule.
Centre finger = Conventional Current
First finger = Field direction
Thumb = Motion
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Building a loudspeaker
These also use the motor effect
Coil in here
magnet
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HomeworkPages 210 to 213. Answer the
questions on all pages. Finish for homework due 15th October
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Today’s lesson
• How the motor effect can build a motor• Electromagnetic induction
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Gather round!
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D.C.Motor
Commutator ensures that every half rotation the current
direction reverses in the coilbrushes
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D.C.Motor
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Electromagnetic induction
• Make a coil using wire. The coil should be wide enough to easily move a magnet inside
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Electromagnetic induction
• Put your coil in this circuit. The multimeter should be on the μA scale.
μA
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Electromagnetic induction
• MOVE a magnet in and out of the coil. Watch the meter!
μA
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Electromagnetic induction
If a magnet is moved inside a coil an electric current is induced (produced)
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Electromagnetic induction
If a magnet is moved inside a coil an electric current is induced (produced)
COPY this please!
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Electromagnetic induction
A electric current is induced because the magnetic field around the coil is changing.
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Gather round
Again?
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Generator/dynamo
A generator works in this way by rotating a coil in a magnetic field (or rotating a magnet in a coil)
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Motor = generator
If electric energy enters a motor it is changed into kinetic energy, but if kinetic energy is inputted (the motor is turned) electric energy is produced!
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Let’s try some questions!Pages 214 and 215.