What is the difference between AC generator and DC generator?

Asked By: Ghailan Lind | Last Updated: 5th January, 2020
Category: science physics
4.9/5 (203 Views . 38 Votes)
In an AC generator, the electrical current reverses direction periodically. In a DC generator, the electrical current flows only in one direction. In an AC generator, the coil through which the current flows is fixed while the magnet moves. The construction is simple and costs are less.

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Accordingly, what is the difference between AC motor and AC generator?

The difference between an AC motor and generator is the basic principles of operation: one takes mechanical energy from a prime mover and generates usable electrical energy, the other takes available electrical energy and generates useable mechanical energy in the form of shaft rotation.

Also, how does an AC generator work? An AC generator is an electric generator that converts mechanical energy into electrical energy in form of alternative emf or alternating current. It works on the principle of "Electromagnetic Induction". This produces an electric current through the galvanometer and the slip rings and brushes.

Herein, what are the advantages of AC generator over DC generator?

Advantages of A.C. over D.C. / Why generation is done in A.C.

  • AC can be generated at high voltages, but DC cannot be generated at high voltages because sparking starts at the commutator at high voltage, due to which commutator gets damaged.
  • High voltages AC generators are much simpler and cheaper than DC generators of the same range.

What is the difference between AC and DC?

The difference between AC and DC lies in the direction in which the electrons flow. In DC, the electrons flow steadily in a single direction, or "forward." In AC, electrons keep switching directions, sometimes going "forward" and then going "backward."

38 Related Question Answers Found

What are the 2 types of generator?

Generators are classified into two types, AC generators and DC generators.
  • AC generator.
  • DC generator.
  • AC motor.
  • DC motor.
  • Permanent magnet machines.
  • Brushed machines.
  • Induction machines.

How is AC converted to DC?

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current.

What is AC and DC dynamo?

Definition. AC generator is a mechanical device which converts mechanical energy into AC electrical power. DC generator is a mechanical device which converts mechanical energy into DC electrical power.

What is the purpose of a motor?


An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of rotation of a shaft.

What is the principle of motor and generator?

Motors works on the principle that a current carrying conductor experiences a force when placed in a magnetic field. Generators work on the principle of electromagnetic induction. The shaft of an electric motor is driven by a magnetic force which is developed between the armature and field.

What type of motor is used in generator?

An induction generator or asynchronous generator is a type of alternating current (AC) electrical generator that uses the principles of induction motors to produce power. Induction generators operate by mechanically turning their rotors faster than synchronous speed.

Which is more dangerous AC or DC?

AC is more serial killer as AC with less frequency (50 Hz in EU and 60 Hz in US) is more dangerous than the DC having the same level of voltage. In other words, 230V AC (or 120V AC) is more dangerous than 230V DC or 120V DC respectively.

What are the advantages of DC?

The biggest advantage of DC electricity is that it is easier to store than AC electricity, especially on a small scale. Storing electricity when it is made, for use later when it is needed, is a critical concept for a hybrid independent power plant.

Which is cheaper AC or DC?


AC is cheaper. Distribution and Consumption - Distribution of AC is more mainstream however systems need to be developed for DC transmission as there is no way of stepping up the voltage by means of a transformer to transmit over considerable distances.

Why is AC preferred over DC?

Answer: Ac is more preferred than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transimission. When fault occurs it is easy to interrupt ac supply.

Which is better AC or DC?

DC is more efficient than AC power and has lower line losses than AC lines. With AC, the current travels on the skin of the conductor while with DC, the current flows throughout the entire conductor and not just the conductor skin. DC is more efficient than AC power and has lower line losses than AC lines.

What is the disadvantage of DC drive?

Frequent starting, braking and reversing. The disadvantage of D.C. drives is the presence of a mechanical commutator which limits the maximum power rating and the speed. The variable speed applications are dominated by D.C. drives because of lower cost, reliability ad simple control.

What are the advantages of generator?

Benefits of Owning a Residential Backup Generator Include:
Delivers power quickly and automatically during a blackout. Allows homeowners to operate their homes, including heating and cooling systems, televisions, computers, and other appliances. Allows homeowners to maintain comfort and safety levels during emergencies.

What is meant voltage?


Voltage, also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field. Voltage can be direct or alternating. A direct voltage maintains the same polarity at all times.

Why are AC generators important?

AC motors are easier to maintain as a result. They are also cheaper to own and have quieter operation. They also have a longer life compared to dc motors. For optimal use, it is important for a dc generator to produce a voltage at a certain level.

What are the types of AC generator?

As previously discussed, there are two types of AC generators: the stationary field, rotating armature; and the rotating field, stationary armature. Small AC generators usually have a stationary field and a rotating armature (below Figure).