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Question
Identify the figure and explain its use.
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Solution
The figure shows the construction of an electric DC generator.
Instead of a light bulb, an ammeter is displayed here.
Working: An external machine rotates the axle. Electromagnetic induction causes the generator's armature coil to produce an electric potential difference when it rotates in a magnetic field. This generates a current, as indicated by a galvanometer or the lightbulb's glow. The coil's sense of rotation determines the current's direction.
One brush in a DC generator is always in contact with the coil's upward-moving arm, while the other brush is in contact with the coil's downward-moving arm within the magnetic field. As a result, the circuit's current always flows in the same direction as long as the coil rotates in the magnetic field.
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