How many key terms can you find in FIVE minutes?

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Presentation transcript:

How many key terms can you find in FIVE minutes? More about Magnetism! How many key terms can you find in FIVE minutes?

Magnetism Treasure Hunt Find the information sheets Use the sheets to complete the question sheet Prizes for: first correctly completed sheet OR most correct answers after 20 minutes AND Best answered sheet

Complete the Magnetism Key Terms worksheet... ... then complete the How a Loudspeaker Works worksheet

Loudspeaker COIL MAGNET CONE

The signal generator sends an electrical ___________ through the coil. The ________ becomes magnetised. This pulls the coil towards the ____________. The coil is attached to the _________ so as the coil moves the cone also ________. As the current in the coil __________ the coil moves back and forwards, causing the cone to __________. This produces a sound. The vibrating cone produces ___________. current coil magnet cone moves changes vibrate sound

Force on a Current-carrying Conductor & Motor Effect 

Reminder! Moving charges (electric currents) produce a magnetic field Conventional current – electrons flow in the opposite direction

Magnetic force on current We know that a current produces a magnetic field. It therefore makes sense that the current will be affected by placing a magnet nearby N S

Magnetic force on current Due to the magnetic field by the current the magnet will cause force on the wire. If there is no force holding the wire in place then the wire will move

Fleming’s left hand rule

Direction of force

Example FORCE S N MAGNETIC FORCE CURRENT

You try N 1. S

You try N 2. S

You try 3. S N WATCH IT IN ACTION!

Question Time! Magnetic fields Draw the magnetic field around: A straight wire b) a solenoid 2. What direction do magnetic field lines always point? 3. What happens to the magnetic field if the direction of the current is reversed? Fleming’s Left Hand Rule What happens to a wire carrying current when it is placed at right angles to a magnetic field? Draw a diagram showing the direction of current, magnetic field and movement. What angle are these all to each other?