What is Difference Between Ac And Dc Generator
The difference between alternating current and direct current generators is one of the most discussed topics among physics enthusiasts.
In this article, the main differences between alternating current and DC generator are given in a simple and easy to understand table form. This difference between alternating current and DC generator can help students better understand this topic and remember things better.
Before moving on to the differences, it is important that you know in detail AC and DC generators. Knowing the nuances, understanding the differences becomes easier and easier.
What is an AC Generator?
An alternating current generator is an electrical generator that converts mechanical energy into electrical energy in the form of EMF or alternating current. The alternating current generator works on the principle of “electromagnetic induction”.
What is a DC Generator?
A DC generator is a machine that converts mechanical energy into electricity (direct current). The energy change process uses the principle of induced electromotive force.
What are the differences between AC and DC Generator?
| Sl. No. | Differentiating Property | AC Generator | DC Generator |
|---|---|---|---|
| 1 | Definition | AC generator is a mechanical device that converts mechanical energy into AC electrical power. | DC generator is a mechanical device that converts mechanical energy into DC electrical power. |
| 2 | Direction of Current | In an AC generator, the electrical current reverses direction periodically. | In a DC generator, the electrical current flows only in one direction. |
| 3 | Basic Design | 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. | In a DC generator, the coil through which the current flows rotate in a fixed field. The overall design is very simple but construction is complex due to commutators and slip rings. |
| 4 | Commutators | AC generator does not have commutators. | DC generators have commutators to make the current flow in one direction only. |
| 5 | Rings | AC generators have slip-rings. | DC generators have commutators. |
| 6 | Efficiency of Brushes | Since slip-rings have a smooth and uninterrupted surface, they do not wear quickly and are highly efficient. | Both brushes and commutators of a DC generator wear out quickly and thus are less efficient. |
| 7 | Short Circuit Possibility | As the brushes have high efficiency, a short circuit is very unlikely. | Since the brushes and commutators wear out quickly, sparking and short circuit possibility is high. |
| 8 | Rotating Parts | The rotating part in an AC Generator is a low current high resistivity rotor. | The rotating part in a DC generator is generally heavy. |
| 9 | Current Induction | In an AC generator, the output current can be either induced in the stator or in the rotor. | In a DC generator, the output current can only be induced in the rotor. |
| 10 | Output Voltage | AC generators produce a high voltage which varies in amplitude and time. The output frequency varies (mostly 50Hz to 60Hz). | DC generators produce a low voltage when compared to AC generator which is constant in amplitude and time i.e. output frequency is zero. |
| 11 | Maintenance | AC generators require very little maintenance and are highly reliable. | DC generators require frequent maintenance and are less reliable. |
Different Types of Ac And Dc Generator
AC Alternators can be of different types such as three-phase alternators, single-phase alternators, synchronous alternators, induction alternators, etc.
DC generators are of two basic types which are separately excited DC generators and self-excited DC generators. Depending on the field and iron connections, they can be further categorized as DC series, shunt, or composite generators, respectively.
These were the main differences between alternating current and direct current. With the above difference between alternator and alternator, several higher level concepts are also introduced to provide in-depth information about them. This is especially important for students who want to pursue engineering (particularly electrical engineering).
In addition to these differences, students can also refer to other related articles below. Other related articles can help you learn about such issues in a practical and practical way. Click on the links below for more related articles.
Related :
- Electric Generator
- The Electric Motor
- Alternating Current (AC) and Direct Current (DC)