# alternating current versus direct current

by halfANDhalf
Tags: alternating, current, versus
 P: 13 i am currently going over ac and dc currents in school but i want to know more but my teacher isnt going very deep into this subject. Can you help me out please?
 PF Patron P: 7,345 Try using Google for the basics, then re-post if you don't get the help that you want. This stuff is pretty basic, and it would take a WHOLE lot writing to explain it all, especially since you haven't been very specific about what you need to know.
 P: 13 well what i want to know is what appliances use ac and dc and how they are generated
PF Patron
P: 7,345

## alternating current versus direct current

You are asking a very trivial question that you can research with Google in a matter of minutes. Please make some effort on your own, come back here and demonstrate that you have made the effort, and tell us your understanding of the situation. Then, I will be happy to help clarify your understanding, if necessary.
 P: 13 well i found out that dc flows in 1 direction and is useed by cpus, micro electronics,recharging storage batteries. and that ac goes 1 way then goes the other way 60 times a second and that is can be generated by wind, water, nuclear, oil, and that the generators use magnets and that ac is used in power outlets. but i just cant find how DC is GENERATED i googled it several times with different key words but it comes out with stuff too complicated for me to write and if i do my teacher will suspect something b/c im in the 8th grade so can any1 help me with that like give me a website that explains that part??
 PF Patron P: 7,345 HINT!!!! You can smooth and rectify AC to produce DC. Pay attention to "rectification" because that word will be your friend. Good luck!
 P: 13 thanks for the hint but i dont see how that explaines how dc is produced
 PF Patron P: 7,345
 P: 13 oh come on, i'm not that smart im only 14!!! our probe classes havent even tapped into rectification!
 P: 13 well does anyone know how DC can be generated from AC?
 PF Patron P: 7,345 halfANDhalf, if you ever expect to understand electronics, you have to grasp the concept of rectification. I can't spoon-feed it to you unless I want to spend hours and hours explaining it. Please Google it. Hint: Turbine-generator sets are designed (with rectifier circuits) to charge the batteries that are used to "flash" the generator on start-up to create a field that can be used to get the generator producing power. Every large generating station uses both AC and DC power to do their magic. I understand that you are only 14, but when I was a child, I lived in a tiny town with a very large hydro-dam and the operators knew me and allowed me to visit the power-plant from time to time. The battery-room (all DC) of a large hydro-dam can be huge and daunting! I understood field flashing 'way before I was 14 - at least on some level.
 P: 13 oh ok thanks but when u said if i want to understand electricity i need to know ratification or wahtever i just dont know that far into electricity so when i get there i will better understand what you said
 P: 13 never mind i found it out it means : conversion of alternating current to direct current right? thank you
 PF Patron P: 7,345 Listen! You can take alternating current and run it through a tube rectifier or through a capacitor-based rectifier and make DC out of it. It's also possible to produce DC that has AC-like ripples. Study! Please take the time to research electricity and learn - then come back with questions. If you are serious about learning, I will help you, and others will, too. If you keep posing general questions about very basic concepts, people will ignore your posts and you will not benefit.
P: 21,399
 Quote by halfANDhalf well does anyone know how DC can be generated from AC?
As Turbo indicated - rectification. Please show some effort by oneself.

For small voltages and currents, simple diodes are used in a diode bridge, but for large power systems, silicon controlled rectifiers (SCRs) are necessary. Also, its better to use multiple phases, with each phases out of phase, such that as the voltage of one phase is decreasing, the voltages of the other phases are increasing.

This site might be helpful for understanding electronics and electrical theory.