IV. Translate the following text into your native language:
A device for converting mechanical energy into electric energy is called a generator. The function of a motor is just the reverse, that is, it transforms electric energy into mechanical energy. The enormous energy, gas engines , and water turbines can now be transformed into electricity and transmitted many miles. The generator has revolutionized modern industry by furnishing cheap electricity.
The essential parts of a generator are: a) the magnetic field which is produced by permanent magnets or electromagnets; and b) a moving coil of copper wire, called the armature wound on a drum.
Direct current (D.C.) generators are used for electrolytic processes. Large d.c. generators are used in certain manufacturing processes, such as steel making.
Generators of small capacities are used for various special purposes, such as welding, automobile generators, train lightning, communication systems, etc.
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