Electric Current, An Explanation

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Күн бұрын

Electric current is the rate of flow of charge past a point in a closed circuit. In an electric circuit this charge is carried by electrons moving through a wire but it can also be carried by ions in an electrolyte.
The symbol for current is I, which originates from the French phrase intensité du courant (current intensity). The SI unit of electric current is the ampere (A). One ampere is equal to one coulomb per second. Electric current is measured using a device called an ammeter
In a conductor the negatively charged electrons are the charge carriers and are free to move about in the metal. A flow of positive charges gives the same electric current, and has the same effect in a circuit, as an equal flow of negative charges in the opposite direction. The direction of conventional current is defined as the same direction as positive charges flow. Since electrons, the charge carriers in metal wires and most other parts of electric circuits, have a negative charge they flow in the opposite direction of conventional current flow in an electrical circuit.
Chapters:
0:00 Electric Current, An Explanation
0:30 What is Current
08:45 Equation and Calculation
09:45 Example Problem
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Пікірлер: 73

@gameplaytru 3 жыл бұрын

This video means a lot to me before I was confused about why the electric current is in the opposite direction of the flow of electrons... thank you so much for the explanation.

@stepbystepscience 3 жыл бұрын

I'm very glad it helped. Thanks for letting me know.

@thomastammaro693 3 жыл бұрын

Thank you!!I had to slow down the speed a bit to keep up , But you broke it down very well. I just subscribed. 👊

@stepbystepscience 3 жыл бұрын

You're welcome and thanks for subscribing!

@chamomile3620 3 жыл бұрын

Online class really be giving me hard time on physics . Good thing I found your channel! Yayyy! You're way better than my instructor 🖐️

@stepbystepscience 3 жыл бұрын

Wow, thanks!

@chamomile3620 3 жыл бұрын

you're amazing. Thank you for a clear explanation

@stepbystepscience 3 жыл бұрын

You're very welcome! I'm glad the video was helpful.

@tedlahm5740 4 жыл бұрын

Sir: Thank you for all past information. Question please. I have a 120 volt AC circuit with a 60 ohm resistance load. Drawing 2 Amps of current on a Charge of 2 coulombs per second. 240 Watts of power. The question is DO THESE 2 coulombs pass by ANY GIVEN POINT back and forth 60 times per second because it is AC? Thank you.

@stepbystepscience 4 жыл бұрын

yes

@user-wm5kr5iz6i Ай бұрын

Good

@stepbystepscience Ай бұрын

Thx

@tedlahm5740 4 жыл бұрын

Sir: A charge (coulomb/amp) can carry 9 volts DC or 120 volts AC. What changes in the charge, is it PRESSURE pushing the electrons or are MORE electrons ADDED to the charge at higher voltage? thank you.

@stepbystepscience 4 жыл бұрын

Higher voltage also known as electromotive force (emf) can be thought of as more pressure. Does that answer your question?

@TiberiusStorm 5 жыл бұрын

When the switch is opened would it read as Infinite Resistance because there's so much resistance? But if it's closed then it would have Continuity?

@stepbystepscience 5 жыл бұрын

Yes, open circuit has infinite resistance, I am not sure what s meant by continuity. I would say a closed switch has not resistance.

@leah9389 4 жыл бұрын

Isn't the current only transient in 5:15, so current won't flow after that?

@amalas1212 2 жыл бұрын

Thanks from Jordan 🇯🇴 ❤️

@stepbystepscience 2 жыл бұрын

You're welcome from Germany!

@christianmonturanoii6539 3 жыл бұрын

Cool bro

@stepbystepscience 3 жыл бұрын

Thx!

@boyanatanassov9263 3 жыл бұрын

Awesome video...

@stepbystepscience 3 жыл бұрын

Thanks 😊

@l1amm4n 2 жыл бұрын

Thanks for the explanation, needed this for my exam.

@stepbystepscience 2 жыл бұрын

You are welcome and best of luck for the exam!

@johnhopkins6260 Жыл бұрын

As current flow through the battery is known (evidenced by internal resistance creating internal heat, in a closed circuit); What is unclear (for me) is the mechanism of electrons moving from the internal positive component of the battery, to the negative. (something to do with atom-level transference of electrons between molecules?) "short-circuit" a battery, it will heat up. Or, plug two 9V batteries into each other, in opposite directions.. it will warm up very quickly. Please explain. FWIW, "current flow" = electricity, "electron flow" = electronics (AFAIK)... perhaps why, with transistors, the labelling convention of "collector" vs. "emitter"... and/or "source" vs. "drain" ("base"/"gate", notwithstanding)

@stepbystepscience Жыл бұрын

This website explains it: physics.stackexchange.com/questions/696486/where-do-electrons-flow-inside-a-battery-what-happens-inside-a-battery

@tedlahm5740 4 жыл бұрын

Good video. The DC battery shows the electrons flowing (being pushed and pulled) from the copper wire BACK to the battery, but we could show the electrons going BACK to the copper wire. NEXT show this for an AC ckt. Thank you.

@stepbystepscience 4 жыл бұрын

OK, thanks.

@benioffprim7042 3 жыл бұрын

Very helpful ..Thank you.

@stepbystepscience 3 жыл бұрын

Glad it was helpful!

@jbardige 3 жыл бұрын

This was very informative. There is one thing I cannot get my head around (only science in my degrees in Political Science): what is the difference between current and power? If current is the amount of charge passing a point in a wire in a specified unit of time, how is this different from power. Power = I * V but how does voltage affect current to determine power?

@stepbystepscience 3 жыл бұрын

Power is the amount of work done per unit of time. For an electric circuit it is the rate electrical energy is transferred by a circuit. Current is Coulombs/second and volts is Joules/Coulomb, if you multiply those two units you get Joules/ second...or how many joules of energy are transferred per second. Does that help?

@Ronbo765 4 жыл бұрын

Two questions: After the battery is depleted, do all of the electrons end up back in the wire? Also, since there is a finite number of electrons in the wire, why doesn’t that fact limit the amount of current that the wire can carry?

@stepbystepscience 4 жыл бұрын

The electrons just go around the circuit. The electrons don't get used up, just the energy that is given to them from the battery gets used up, then the battery has no more energy and the current stops.

@Ronbo765 4 жыл бұрын

Step-by-Step Science Right, but the electrons came from the wire, so they end up back in the wire after the battery can supply no more energy? And question two, I’ll rephrase. More voltage means more electrons are recruited from the wire means more current (amps) flow?

@tgbmafia5399 2 жыл бұрын

Thank you for teaching

@stepbystepscience 2 жыл бұрын

You are welcome, I love to teach!

@bell1095 5 жыл бұрын

What repells electrons from the (opposite) pole, how big is that repelling power, is it constant or does it change by time ?

@stepbystepscience 5 жыл бұрын

Like charges repel, as the distance between the charges increases the force between decrease; coulombs law.

@riaddewa831 2 жыл бұрын

thanks sir,you are the best

@stepbystepscience 2 жыл бұрын

So nice of you, thanks!

@talhajat3301 3 жыл бұрын

is positive charges dont move then how is there current with positive charges

@sarojkoirala3968 4 жыл бұрын

I am in dilemma that Current is the flow of 1. Electrons only 2.Negative and positive ions both 3.positive ions only 4.Electron and positive ions both Which option is correct please provide me its exact answer.

@stepbystepscience 4 жыл бұрын

My definition of current is, "the flow of positive charge". Although it is really the electrons that are moving.

@faizasikandar6050 4 жыл бұрын

Any vedio on diodes and their graphs

@stepbystepscience 4 жыл бұрын

Sorry no!

@faizasikandar6050 4 жыл бұрын

My favourite teacher

@stepbystepscience 4 жыл бұрын

That's nice!

@sallaklamhayyen9876 3 жыл бұрын

great job thank you please i want to learn electronic please i want to learn electronics , so where should i do start and what i need to learn ? can you help me

@atheistaetherist2747 3 жыл бұрын

So if electricity is the flow of electrons in the wire then why does the electrical force travel at the speed of light in the insulation covering the wire (say 0.66c km/s), or if no insulation then it travels at the speed of light in air (say 0.9999999c km/s). How do the smart electrons in the wire know whether there is insulation or not. For the answer google Ivor Catt or Forrest Bishop.

@theinfamoustop104 4 жыл бұрын

Best

@stepbystepscience 4 жыл бұрын

Thanks

@mobinnida7332 4 жыл бұрын

You told that psitive charges didnt move

@stepbystepscience 4 жыл бұрын

Yes the positive charges don't move, but if one negative charge more to the left it is just like one positive charge moving to the right.

@Outside248 4 жыл бұрын

why didnot you explain as a detailed plan ????? but anyway thank you nice explanation

@stepbystepscience 4 жыл бұрын

Thanks

@bonganemathebula7556 3 жыл бұрын

Am i correct to say that current is amount of charge flowing through a given point per second...nvm i typed this comment b4 9:22

@stepbystepscience 3 жыл бұрын

Yes.

@getsetstatus5152 3 жыл бұрын

What is your consideration about the electric current? Answer me please please please please please please please please please please please please please please please please please please please please 🥺🥺🥺...

@stepbystepscience 3 жыл бұрын

I do not understand what you mean about the "consideration" about the electric current.

@HalalKebab-hf3fj 8 ай бұрын

now it’s 69 comments

@stepbystepscience 7 ай бұрын

awesome

@TomAustinIII 3 жыл бұрын

525 coulombs times about 6 times 10 to the 18th electrons per Coulomb give you about 3150 times 10 to the 18th or 3.sonething times 10 to the 21 electrons I don't get why we always use other stupid shit to represent Coulomb when I feel like it's more straight forward to always use number of electrons easy for In head math

@h0wud0in1 2 жыл бұрын

Hahahaha. He explains electric current interms of a Voltage a Resistor and Ohms law. Nothing more confusing than this can exist ! Anyone whos interested id check out Atoms and Sporks video: What Are Electrons REALLY Doing In A Wire? Quantum Physics and High School Myths

@HalalKebab-hf3fj 8 ай бұрын

Joooo

@stepbystepscience 7 ай бұрын

Joooo