Physical Science 6.3a - Voltage

[AceFrolic720]

a dumb question perhaps...

but could we like run other household appliances using the car battery?

[derekowens]

@AceFrolic720 Not a dumb question. Virtually every household appliance is designed to run on 120V AC, but the car battery produces 12V DC. You can use a power inverter, though, to convert the 12V DC from the car battery to 120V AC. Inverters are pretty cool, in my opinion. I keep one in each car!

[8644371]

What if I connect A LOT of lightbulbs to a wire, and THEN connect that wire to the car battery?

Would that be safer?

[TheDevilvivek]

v = w/q what does this mean and why eloctons come back when they go to toaster

[TheDevilvivek]

v = w/q what does this mean

[TheMarvin123abc]

water flows downhill because of gravity, thanks for this video... you derekowens and khanacademy are my favorites. heroes!

[TheMarvin123abc]

water flows downhill because of gravity

[bluejimmy168]

you said in the wall outlet, there are two slots. One with higher electric potential and one with lower electric potential so that electrons flow from the higher end to the lower end. The lower end is connected to the ground. Wouldnt that be a waste of energy to send electrons to the ground? Can someone build a circuit that loops the lower potential end back up to the higher potential end? if we have a loop, we will have infinitely amount of energy? i dont know just a thought. THanks.

[derekowens]

@bluejimmy168 Well, that's a good thought. The problem is that it takes effort (more energy) to life the electrons back up to higher potential. So you can't get the electrical energy for free. About lifting them back up to higher potential, that is basically what the power company does. You can imagine electrons coming out of one slot, expending their energy in your toaster, then going back into the other slot and all the way back to the power company, where they get re-energized.

[derekowens]

@bluejimmy168 In reality, it's a little more complicated, because the power company sends us alternating current rather than direct current. But the idea of a big loop, with the electrons gaining energy at the power company and expending energy in your toaster, does accurately explain the energy production and transfer.

[bluejimmy168]

@derekowens Thanks, this is awesome!! i wish college was like this where we watch videos and chat. I have learned so much from you. Thank you for taking your time and teach us!!! Thank you thank you.thank many more thankssss.

[Sindyrocks2009]

'The potential difference is largest across components with the greatest resistance.' ( from a book)

Does it basically mean that the ' electrical push ' ( voltage ) across a component is largest in a component with a great resistance?

Thanks! :)

[derekowens]

@Sindyrocks2009 What you say is true *if* you are talking about multiple components connected in series. If two (or more) components are in series, the one with the greatest resistance also has the greatest voltage.

[Sindyrocks2009]

@derekowens So what if they were in parallel?? thanks

[derekowens]

@Sindyrocks2009 If they are in parallel, the voltage is the same in each component, but the current gets divided among the components. Components that have more resistance end up having less current flow. If you're interested, have some videos in the Physics course on resistors in series and parallel that explain this in more detail.

[Sindyrocks2009]

Yey i get it!

[tomruthgear]

great vid

[gaica1]

6:00 I've burned my finger-tips and that incident has made me more interested in current.

[AhmedSabryAmin]

so cooooooooooooooooool

awesome ..

easy to understanding ,, especially with the other language speakers ..

[Johnjpcoc]

thank you so much for all your hard works.

:)

[DesRecon]

6, Nice explanation of High / Low PE.