One of the first important things to learn when studying electrical engineering is the difference between AC and DC current. AC and DC are used all over the place, whether it’s your charger or the power lines outside your house.
If you know what the difference is between AC and DC, it’ll be much easier to understand electricity and how it is used to provide power.
What Is DC (Direct Current)?
Direct current means DC. In DC, the flow of electric charge is constant in one direction. Electrons flow in one way through the circuit from negative to the positive.
A battery is the most common example of DC. A flashlight, or your phone, or even your laptop runs on DC.
Here’s some more information on DC:
Flows in only one direction
Voltage does not change; stays constant
Batteries & electronics
What Is AC (Alternating Current)?
Alternating current means AC. In AC, the direction in which electric charge flows, changes back and forth constantly instead of flowing in just one direction.
AC is what powers homes and other commercial applications.
Here are some things to remember about AC:
Changes direction
Can be transmitted over long distances
Power lines to your home
Why Do We Use AC Power?
The number one reason we use AC power is efficiency. AC can be stepped up or stepped down easily with a transformer. It’s ideal for traveling long distances with minimum amount of power loss.
That is why AC is what is generated at power plants, and the reason why it is delivered to cities, homes, and businesses.
What About DC?
DC is still important for electronics. DC can be found in:
Mobile phones
Laptops
Power banks
LED systems
Electronic circuits
While power from the wall outlet will be AC, most devices will step down the voltage and turn the AC into DC to operate their components.
AC vs DC
AC vs DC is pretty simple in summary.
Direction: AC constantly changes direction while DC flows only in one direction
Use: AC for homes and industry while DC is used for electronics
Transmission: AC for long distance with minimal loss while DC is not as efficient for traveling long distances
Source: AC from power station while DC from battery
Conclusion
AC and DC are both used in electrical engineering. You could not really say one is more important than the other. They are essential in different areas.
Once you know the difference between AC and DC, other things will become easier to learn.
ElectroBase focuses on making learning as simple as possible to help you understand the basics.