Question

State two dis-similarities and one similarity between a d.c motor and an a.c generator.

Answer 1

Hint:By using electromagnetic induction, electric motors transform electricity into motion.In order to create a rotational movement, electric motors use the forces generated by magnetic fields. The wire will travel if you bring a stretch of wire into a magnetic field and send a DC current through it (such as from a battery). This is called the influence of the motor.The AC generator is a mechanism that transforms mechanical energy into electrical energy, often referred to as alternators.

Complete answer:
Two dis-similarities and one similarity between a d.c motor and an a.c generator is: the D.C engine is a device that transforms electrical energy (voltage/current) into mechanical energy, but the A.C generator is a device that converts electrical energy (voltage/current) into mechanical energy.

The D.C motor has constant polarity and current flowing in the same direction, but the A.C generator has electricity in which the voltage flips polarity (+ve to-ve and vice versa) and the current flows back and forth (Changes the direction periodically).

The D.C motor produces current in the same direction while the slip rings of the A.C generator are used to create current in alternating directions.The similarity of the d.c motor to the a.c generator is that both electrical devices operate on the basis of the Electromagnetic Induction theory.

Note:Here we should remember that D.C motor transforms electrical energy into mechanical and A.C generator transforms mechanical into electrical. This is the significant difference in distinguishing both. The electrical energy in a generator produced is in the form of a sinusoidal output waveform of an alternating current. Steam turbines, gas turbines and combustion engines normally supply mechanical energy.