Direct Current: If the current flows in one direction only, it is called a direct current. It is that current which flows in a circuit with a constant magnitude in the same direction.
Alternating current: If the current reverses direction after equal intervals of time, it is called alternating current. It is that current whose magnitude and direction change alternately and regularly with the passage of time.
Principle of Electric Generator
The electric generator works on the principle that when a straight conductor is moved in a magnetic field, then current is induced in the conductor.
Types of Electric Generator
Electric generators are of two types:
In order to obtain direct current (which flows in one direction only), a D.C. generator is used. The working of D.C. generator is similar to that of an A.C. generator. The slip rings of an A.C. generator are replaced by a commutator. So, the A.C. voltage generated id converted to D.C. voltage. Thus, it works as a D.C. generator.
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