USE FLEMING'S LEFT HAND RULE TO FIND DIRECTION OF FORCE
Motor Effect explanation:
When a current flows through a wire, a magnetic field is created. If we place this wire inside the magnetic field of a permanent magnet these two magnetic fields interfere with each other and the wire feels a force which results in the movement of the wire. This is called the motor effect.
Electric Motor explanation:
The current flows through the circuit connected to the carbon brushes. When the carbon brushes contact the split-ring commutator, the current flows through the coiled wire and a magnetic field is created. This magnetic field interfers with the two permanent magnets on either side of the coil and the so the wire feels a force. The pivot allows the wire to rotate and the split-ring commutator allows the current to swap direction every half turn in order to keep the coil rotating.
To increase the rate at which motor turns we can - increase number of loops of wire, increase strength of permanent magnets (increase strength of magnetic field), increase current flowing
Practical motors - perm. magnets replaced with curved electromagnets(stronger), single loop replaced with several loops (smoother), coils wrapped around soft iron core (efficent, powerful)
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