Here we have an open DC motor with permanent magnet for the field. An old armature from a faulty hedge trimmer was used As it was for a school project The following topics had to be covered.
Chemical energy -- We used a lead acid battery Kinetic energie -- We got the armature rotating Noise -- We got audio from the speaker Heating -- We got some heating in the armature, and commutator bars Light -- We made a special LED driven via coil Magnetic -- We established that the armature won't rotate without the magnet underneath.
Note ! We put a 56 ohm resistor in series with the speaker to protect the speaker from a 12 Volts burn out.
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