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Practice each question, then open the answer or worked solution.
State the principle of an electric generator.
An electric generator works on the principle of electromagnetic induction. In a generator, electricity is generated by rotating a coil in the magnetic field.
Name some sources of direct current.
DC generators and cells are some sources of direct current.
Which sources produce alternating current?
Power plants and AC generators are some of the sources that produce alternating current.
Choose the correct option.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
c. half revolution
When a rectangular coil is rotated in a magnetic field, the direction of the induced current changes once in a half revolution; as a result, the direction of the current in the coil remains the same.