Apply your knowledge of electric generators in this set of free practice questions.
A generator with a single rectangular coil rotated at constant angular velocity in a uniform magnetic field produces an emf that varies sinusoidally in time. Note the generator is similar to a motor, except the
et is attracted toward the iron core. This attraction does (positive) work on the turning perma-nent magnet as the two poles approach but it also does negative work on the perma ent magnet as the
On applying Fleming''s right-hand rule to the sides AB and DC of the coil we find that the currents in them are in the directions B to A and D to C respectively.
Revision notes on The Generator Effect for the Oxford AQA IGCSE Physics syllabus, written by the Physics experts at Save My Exams.
In the case of a battery, electricity flows in one direction, from positive to negative. Everything is straightforward. In the case of a generator, however, things get a bit more complicated. It is possible
The current is positive (+) in one direction and negative in the other (-). The smooth rings play a critical role in the generation of alternating current.
DC generators produce unidirectional current so their emf are conventionally displayed as positive. AC generators produce bidirectional current. The direction alternates twice every revolution.
Note the generator is similar to a motor, except the shaft is rotated to produce a current rather than the other way around. Charges in the wires of the loop experience the magnetic force, because they are
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