AC and DC current are two types of electric current that are used to power various electrical devices. AC stands for Alternating Current while DC stands for Direct Current. There are several differences between the two types of current, which are explained below:

1. Definition:

AC current is a type of electric current that changes direction periodically. It varies in amplitude and direction over time. On the other hand, DC current is a type of electric current that flows in one direction only. It does not change direction over time.

2. Source of Power:

AC current is generated by power plants, generators, and alternators. These devices produce electrical energy that is transmitted through power lines to homes, businesses, and industries. DC current, on the other hand, is produced by batteries, solar cells, and other devices that convert chemical or electromagnetic energy into electrical energy.

3. Voltage:

AC current has a varying voltage that changes direction periodically. The voltage of AC current can be increased or decreased using transformers. DC current, on the other hand, has a constant voltage that does not change over time.

4. Efficiency:

AC current is more efficient than DC current when it comes to long-distance transmission. This is because it can be easily converted to higher or lower voltages using transformers, which reduces energy loss. DC current, on the other hand, is less efficient when it comes to long-distance transmission because it requires more energy to maintain a constant voltage.

5. Applications:

AC current is used to power most household appliances, such as refrigerators, air conditioners, televisions, and computers. It is also used in industrial applications, such as motors, pumps, and generators. DC current is used in devices that require a constant voltage, such as electronic devices, batteries, and electric vehicles.

In conclusion, AC and DC current are two different types of electric current that have different properties and applications. AC current changes direction periodically and is more efficient for long-distance transmission, while DC current flows in one direction only and is used in devices that require a constant voltage.