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When a current carrying wire is in a magnetic field it experiences a force. The size of the force experienced can be increased by either increasing the strength of the magnetic field or increasing the current in the wire. If the wire is parallel to the magnetic field it does not experience a force. The generator effect is the induction of a potential difference when a wire experiences a change in magnetic field). In a transformer, there are primary and secondary coils. An AC current is fed into the primary coil, leading to an alternating magnetic field being passed to the secondary coil in an iron core. By the generator effect, this induces a potential difference and hence current in the secondary coil. The relative number of coils between primary and secondary determines the potential difference produced. A dynamo produces a direct current with the use of a mechanical commutator.
The motor effect: Creating a force(movement) by passing a current through a conductor in a magnetic field The generator effect: Creating a current in a conductor by moving it through a magnetic field. The motor effect and generator effect are the opposite of each other. Using Fleming's Left Hand Rule, you can predict the direction of the movement(motor effect) or current(generator effect) based on the direction of the other two factors(direction of magnetic field and current or movement)
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