DC and AC Generators and AC Induction Motors – Practice
1) A student builds a model AC generator with a frequency of 50Hz.
a) On the graph below label the axes emf and time. Draw a graph of the induced emf for two cycles of the coil:
b) On the same graph draw the induced emf if the coil now rotates twice as fast:
c) On the same graph draw the induced emf if the magnetic field in the model was half of its original strength:
2) Determine the polarity of the terminals on the DC generator below: