Total Control (TV series)
2019
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About this unit
This unit is part of the Physics library. Browse videos, articles, and exercises by topic.
This unit is part of the Physics library. Browse videos, articles, and exercises by topic.
Ohm’s Law allows you to determine characteristics of a circuit, such as how much current is flowing through it, if you know the voltage of the battery in the circuit and how much resistance is in the circuit.
- 10 min
- Sal Khan
- Can electrons move at the speed of light ?No, the faster you push the electron the more energy i takes to push it. the max speed we have sent an electron at is 99.9999992% of the speed of l...
- what happen when there is no resistor in a circuit ?It is impossible to have a zero resistance wire because there are factors of the wire to provide resistance. If the resistance is very low, however...
- when we have resistors in series, the current through all the resistors is same and the voltage drop...ok lets take resistor as blockages in pipe....so won't the water flow be slowed down by the blockages in pipe? similarly, won't the electron flow b...
- I've been taught that current flows from positive to negative, and you are saying that electrons flo...It's just a notation thing that's stuck around. The idea of current was discovered before electrons were, and now everything is backwards.
- Isn't the source of voltage shown in this video a cell, not a battery?Hello Mihir, Maybe. Some sources would identify the schematic symbol as a cell. In practice it makes little difference and the two are used interch...
- Around 5:40, Sal says "the more things there are for the electrons to bump into, or the less space t...not quite, because you need "free" electrons for good conductivity. The best conductors are superconductors. There the electrons are in a quantumme...
- Sal says that no matter how many charges flow from one side of the battery to the other, the potenti...When we draw a symbol for a battery in a circuit, we are indicating an imaginary battery whose voltage never changes. A real battery will maintain...
- I have heard that electrons can travel through a vacuum (hoping this is not a misconception made by ...Yes, electrons can travel through vacuum. The electrons won't have any resistance from direct interactions with matter but being a charged particle...
- I think that Kirchhoff's junction rule is a bit unclear about the fact that while the charge is flow...Kirchhoff's junction rule is really just an extension of conservation of charge. If you have a junction (a place where 3 or more wires meet), the c...
In this video David derives the formula to find the power used by a resistor. Created by David SantoPietro.
- 11 min
- David SantoPietro
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