Circuits (part 1)

Introduction to electricity, circuits, current and resistance

Category:

Education

Tags:

• circuits
• current
• resistance
• amps

[TheEricBooth]

But isn't resistance futile?

[sydniebon]

@ khanacademy i love you soo much.. ! you're the best teacher ever!

[Clipster15]

Sal, you should write a book on physics! Most books are not that great.

[wbeaty]

Electrons flow from the negative

@ShakkIsLife true, if you're certain that the conductors are metal. If they're electrolytes, then the charge is both pos and neg, and flows in both directions. Same with plasmas. In Proton conductors the charges flow from pos to neg.  Physics simplifies this stuff by ignoring the actual charges polarity and declaring them all to be positive. Realworld Ammeters measure CC Conventional Current, and they can't detect the charge carrier polarity.

[wbeaty]

Charges flow *through* batteries of course. A common high-school misconception is that no current exists in the electrolyte, or that battery internal impedance is large (when it's actually near zero.)

Electrons don't flow in circuits, they flow in *metal* circuits. Include a human in your circuit (electric shock,) and there's no electron flow in that living tissue. Same with salt water, the earth, etc. Yes, all circuits are conductors with flowing charge, but they aren't all metals w/electrons

[aaahhhhaaaahhhh]

@TheEricBooth Hahahahaha

[Footballgooner86]

Mr. Alexander, you should watch this...

[775shahrukh]

@DoS37 sorry i couldnt get u

[ShakkIsLife]

@gotty19

Electrons flow from the negative terminal of the battery.

[DoS37]

@775shahrukh

Yeah but then has the current and the voltage changed from a scenario without a resistor? Because they travel slower you say, and therfore has lower energy, which leads to less voltage. And since they travel slower, there is a lower current aswell. Am I following you correctly?

[775shahrukh]

@775shahrukh ..

[775shahrukh]

@DoS37 by definition of current "rate of flow of charge"...if u say after the purpose of the resistor is to resist the flow of current ..ths means less flow of electron pet unit time..in other words we can say that we have slow down the electrons...by applying resistance in the path of flow of electron