Summary
Scientists tried using other parts like iron, but it didn't work as well.
The special magnets keep the car's motor strong and efficient.
That's why the cars still have these rare earth magnets.
Key Points
4 points1
Permanent magnets are made from rare earth materials.
2
Replacing them with electromagnets or iron lowers efficiency.
3
Lower efficiency means the car uses more power.
4
Strong magnets give the motor good starting power and high speed.
New Words to Learn
6 wordspermanent magnet
a magnet that never loses its strength
rare earth
special kinds of rocks that contain strong magnetic material
efficiency
how well something works without wasting energy
torque
the force that helps a wheel start turning
electromagnet
a magnet that works only when electricity is flowing
rotor
the part of a motor that spins around
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