Why can rotating wheels on an EV not generate electricity to constantly charge their battery?

bmay529

I am not an engineer but have always wondered why the wheels on an EV that are constantly moving have not been adapted in some manner to act as a form of dynamo to generate electricity that would top up the charge on the EV battery. Braking has been adapted

Snugbugrug28

Oh dear lord

teediddlyeye

In this house we obey the laws of thermodynamics.

BionicRasher

Wind turbine in the front grill of the EV.

I think I will patent that idea 😁

Akrasia

Now Now, guys, Lets hear him out. I'm sure he has some worthw......

Nope, couldn't do it.

This poster has clearly never cycled a bike that had a dynamo attached to power a light bulb.

Sometimes you have to keep peddling when you're going down hill

Peddling?

Selling ****?

...Ghost...

I'm sensing a lot of friction

Akrasia

https://www.boards.ie/discussion/comment/119562834#Comment_119562834

Its the pre Y2k version of 'scooting'

ELM327

Why not put a magnet at the front of the car to pull it along?

ted1

https://youtu.be/gOMibx876A4

I’ve seen this before

techman1

People seem to be thinking hard about energy now due to the restrictions on russian gas and the rising electricity prices. Its slowly dawning how difficult it actually is to have energy on demand all the time. The wind hasn't been blowing for a month now which means most of our electricity is coming from conventional power stations and we havn't been building any new power stations , the chickens are coming home to roost

Topgear on Dave

https://www.boards.ie/discussion/2058261650/why-can-rotating-wheels-on-an-ev-not-generate-electricity-to-constantly-charge-their-battery

I agree. You are not an engineer. 🤣

That Simpsons scene was the first thing I though of too. LOL

Quantum Erasure

I'll just leave this here...

https://www.youtube.com/watch?v=yCsgoLc_fzI

ted1

https://www.boards.ie/discussion/comment/119563102#Comment_119563102

That video is to long. But there such a thing as apparent wind. Which used correctly can enable you go faster than the actual wind. ( source I kitesurf and experience this).

Panthro

Responses on here are a bit mean. OPs said he's not an engineer and posed a question.

Fair play op, at least your trying to learn more and maybe come up with an idea.

Quantum Erasure

https://www.boards.ie/discussion/comment/119563125#Comment_119563125

the first 25 seconds covers it

innrain

https://www.boards.ie/discussion/2058261650/why-can-rotating-wheels-on-an-ev-not-generate-electricity-to-constantly-charge-their-battery

The short answer is because that will load the system and it will consume more energy. The long one below:

First of all, remember you cannot create energy. What one can do is to take one form of energy and change it into another form of energy. When speaking about conventional cars they use a chemical process - burning - to change the energy stored in the fuel into mechanical energy - movement. Unfortunately, a big portion of the energy is lost as an unwanted type of energy - heat - which is mostly wasted. By adding another conversion, this waste it increasing without a real benefit. What has been done and is still used today is to reduce the waste energy for example by replacing the mechanical breaking with elector-mechanical one. This converts the unwanted mechanical energy into electric one and store it for future use. The key word here is unwanted. Most of the time we want as much mechanical energy as possible to move the car.

https://en.wikipedia.org/wiki/Regenerative_braking

Here is a nice article about this type of breaking.

godtabh

It's been done already

https://twitter.com/alexbeyman/status/1565509339674443776?s=21&t=nQIy9deylLUU27iDq9dyYw