Physical Science 6.3b - DC and AC

[SuperTariqanwar]

sir can you tell me what is volts actually i mean it is the S.I unit of voltage which is the difference between the higher potential energy and the lower potential energy or anything else?

[dreamerkeii]

thank you so muuuuchh... you helped me understand more about this.. :) we have a test tomorrow haha

[Flacorcuera]

"Not hertz like, ouch that hurts" hahahahahhahahahahahaha your funny!!!

[GSubman]

The electrons don't alternate from one direction to another. This explanation of AC is completely erroneous,The first electrons get charged and expand and contracts. This expansion and contraction fo the elctron gets passed on to the elctron beside it and and that is how AC works. The electrons don't move for a certain period of time in one direction and then don't reverse their direction after some time.

[derekowens]

@GSubman The electrons don't expand and contract. And they do in fact move through the wire. In reality they bounce around inside the wire, ricocheting off of the atoms, but the overall drift velocity is in one direction until the current flow reversed. The expansion and contraction you are talking about would accurately describe the propagation of a sound wave.

[luvgory]

how does the electric company make the electrons move in that way???

[sharpclawster]

what font is that ?

[i8O3]

We watched this in class today :D

[metalbonicks]

AC/DC FTW!!!!

[barthez135]

current flow from negative to possitive you wank

[derekowens]

@barthez135 It depends on whether you are talking about conventional current or electron flow. You can design circuits either way. The difference in the two is a source of perennial confusion to science students the world over.

[MrReadthisoutloud]

@barthez135 Little knowledge is a dangerous thing, think before u talk

[JuicyCutie4]

AGHHHH. hate this.

[URJAable]

I got my answer!

[kazzam1996]

what happens if there is a spark between the adapter and the electronics cable ho does it damage the device. pls reply?

[xtdk2010x]

Why are you so much better than teachers at my school? haha

[MrStorm476]

very helpful

thnx:)

[HVACRSupply]

Great video.. But DC is not constant over time, eventually it wiil loose its charge. You should throw a drop off based on time in the diagram.... and drop off unless continually charged with an alternater or other source....

[domainalias]

tnks for the info and 1 question which program younuse for this looks cool

[domyaska]

thanks a lot ..you helped me understanding much better ac electricity...!!!!grazie !!!

[geico1212]

if the electrons dont move to your house then how is energy transmitted?

[derekowens]

@geico1212 Well, electrons don't move from the power company all the way to your house, but electrons do move, and they transfer energy in the process. There are electrons on the wires already. Electrons are all through the wires, every bit of them, from the power company to your house. When you turn on the light, they basically all start to shake at once, and transfer energy in doing so.

[bigbossdeleon]

@derekowens I AM CONFUSED!

If electrons move back and forth, then how is energy transmitted?

what kind of energy? You said there are electrons on the wire already. So, those electrons move back and forth too?

[derekowens]

@bigbossdeleon Energy is transmitted when the electrons "fall" to a place of lower PE. In the case of alternating current, they fall in one direction, and then the direction of the field switches, so they "fall" again in the other direction, losing PE each time. So energy gets transmitted from the power company to you.

[SilyBily32]

@derekowens It is unclear what form of energy this potential energy is converted to. Is it be electrical energy because devices use direct current? I would imagine that the alternating current would arrive at your house and some sort of device would be needed to convert the _____ energy released so that it can be used by, say, a toaster. I am not seeing how the back-and-forth movement of electrons would be used to light a lamp.

[sdimopoulos]

good video!! one correction,@ 1:00 the flow goes from negative to positive.

[OoOIvaNOoQ]

he is using conventional charges

[gaica1]

@sdimopoulos He made no mistake, derekowens explains current using the 'conventional method' as apposed to the 'technical method', which is why you think he is wrong.

[khanzarobi]

Very good explanation !!! Good knowledge and very useful.... keep it up

[DesRecon]

good work :) 7

[kalimeras3]

very nice vid...why though in europe we use 240 volts??? and not 120 like in the us? is one safer than the other one? is one more efficient?

[b0brenjc93]

Great video!