What are Voltage and Current in Electric Circuits? An Electrical Engineering Perspective.

Explains what Voltage and Current are in electric circuits, from an electrical engineering perspective. A couple of analogies are used to help the explanation, by comparing to gravitational forces and physical forces. The video takes a 'particle-theory' approach to electricity, and avoids the particle-vs-wave discussion (this is not a theoretical Physics video).
Check out my 'search for signals in everyday life', by following my social media feeds:
Facebook: www.facebook.c...
Instagram: / iainexplains
Website: www.iaincolling...
Related videos: (see: iaincollings.com)
• Why is Instantaneous Power Flow Important? • Why is Instantaneous P...
• Capacitor Equations Explained • Capacitor Equations Ex...
• What is Reactive Power in Electric Circuits? • What is Reactive Power...
• The 4 Right Hand Rules of Electromagnetism • The 4 Right Hand Rules...
• What Happens when a Magnet Falls Through a Coil? • What Happens when a Ma...
• What are Antenna Gain, EIRP, and Friis Equation? • What are Antenna Gain,...
• How do Complex Numbers relate to Real Signals? • How do Complex Numbers...
• Visualising Complex Numbers with an Example • Visualising Complex Nu...
• Signal Power and Energy • Signal Power and Energy
Full categorised list of videos with pdf Summary Sheets: iaincollings.com

[@2011HPS]

When you learn these things in your 40's, the concepts become even more clear. Thank you very much.

[@iain_explains]

Glad my videos are helpful!

[@sandeepsaikrishna1078]

Very nice video. Nice explanation. Thanks a lot sir

[@iain_explains]

Thanks for liking

[@se2702]

I always love your analogies!

[@iain_explains]

That's great to hear. I'm glad you like the videos.

[@2011HPS]

Prof. What do you do with those paper cut outs after the video is completed 😊

[@payman_azari]

also my question for so long 🤭

[@iain_explains]

I recycle them by using them in future videos. 😁 You'll have to watch all my videos to work out how many I have - based on their various dimensions. 🤣

[@georgepalafox5967]

Excellent analogies Sir. If you had a wire connected to the battery on the negative end (like ur example) where the charge would distribute across the wire and then you instantaneously disconnected the wire what happens to the electron on the wire? Do they simply stay there? They wouldnt go back to the battery since u instantaneously disconnected the wire, right?

[@iain_explains]

I assume you mean instantaneously disconnected at the battery end of the wire? Or do you mean at both ends of the wire? In either case, the answer will be that the excess electrons will stay in the wire (since there is no mechanism applying enough force on them to move them out of the wire into the surrounding air), but they will drift to locations where there is an equilibrium - an equal electrical force in all directions. Of course there is never one single equilibrium location, since there is always energy coming from environmental heat (eg. of the surrounding air) which is causing electrons to move around in a conductor in a random way. Don't forget though, there are far fewer excess electrons in the wire, compared to in the battery and the capacitor, due to the design of batteries and capacitors which ensure high internal electric fields (higher than in a wire, anyway).

[@georgepalafox5967]

@@iain_explains thanks Sir! Is it true that once the circuit is closed an electric field is produced across the wire and this is what induces a force to move the electrons? I saw a video where this claim is made and wanted to get ur perspective. Thanks.

[@iain_explains]

The video I think you are referring to is a "beat up" (IMHO). It tries to imply that the field "carries" the energy - as if the field is somehow seperate from the electrons. And as if "energy" is some sort of "magic" thing that can be "transported". The truth is that physicists still haven't decided if particles actually exist, or if everything is actually a wave. Until that is settled, we have to accept that electric fields and electron charges go together.

[@tuongnguyen9391]

Can you make an explanation on lumped element model versus distributed element model

[@iain_explains]

Thanks for the suggestion. I'm not an expert on that topic, but I'll add it to my "to do" list, and see what I can come up with.