15 Something very new !A computer that will stay booted up when you switch it off – it will be on sale in a few year’s time.It will have memory called MRAM and use special magnets !(Magnetoresistive Random Access Memory)
16 What have we learned? Magnets will attract magnetic materials iron and steelMagnets have two sorts of polesnorth and southMagnets repel each other as well as attractsimilar poles repelopposite poles attractA compass is a little magnetThe Earth is like a magnetcompasses are used to find directionsSpecial magnets are used in computers
18 It moves ! A motor causes movement. An electric current and a magnetic field can make a simple motor.magnet + electric current movement
19 Spot the motorsCan you think of other examples?
20 Very tiny motors can be made When the drawer for a CD opens and closes a tiny motor makes it moveA tiny motor moves the camera lens when the camera is switched onMany small toys have motors in themrobots,Artificial limbs can use tiny motors to act like muscles
21 Magnets are amazing !Magnets + electric currentsmake things move !