cutiepie.3
We have less than two weeks to build an electric car in class. Our energy sources are two AA batteries. The Chassis size is 12 cm X 30 cm. The driveline options are gears, pullies, wheels, chains, propellers, etc. It also must have an on or off switch. I'm not very experienced in this field so any recommendations on how to get this all to work is greatly appreciated. Thnx :)
Answer
There are plenty of instructions on the web. You just have to know how to search it. Try these:
http://www.ehow.com/how_4910601_build-toy-electric-car.html
here is a video: http://www.greenoptimistic.com/2008/04/19/how-to-build-a-solar-powered-car-for-your-kids/
http://www.miamisci.org/girlsrise/session2/beta/Car.html
The main trick with any of these is going to be finding the parts in a limited amount of time. You may have to see what is available locally rather than on the web. Look in a $1.00 store for a hand held battery fan for a motor. It won't have a gear but you might be able to use the fan to power the vehicle. Good luck
There are plenty of instructions on the web. You just have to know how to search it. Try these:
http://www.ehow.com/how_4910601_build-toy-electric-car.html
here is a video: http://www.greenoptimistic.com/2008/04/19/how-to-build-a-solar-powered-car-for-your-kids/
http://www.miamisci.org/girlsrise/session2/beta/Car.html
The main trick with any of these is going to be finding the parts in a limited amount of time. You may have to see what is available locally rather than on the web. Look in a $1.00 store for a hand held battery fan for a motor. It won't have a gear but you might be able to use the fan to power the vehicle. Good luck
Why can't there be a continuously charging electric battery car....?
Seebob
When I was a kid, I had a light on my bike that was powered by a generator that worked by rotating against my spinning front wheel.
Since a motor car has 4 wheels, why could you not attach generators to each wheel, which would continuously recharge the battery.
Once the car has started, it will be powered by the rotating wheels.
I'm no scientist, just a thought, tell me where I am going wrong.
I forgot to mention, there would be a series of batteries, not just one 12 volt battery.
Answer
That's how car batteries work now. But they don't have enough energy to move an entire car.
They could salvage some of the kinetic energy to prolong its charge but it is nowhere near enough to keep the battery completely charged. It would defy the first law of thermodynamics, you can't get something for nothing
It's like the battery is providing some energy. The generators are siphoning some of that and putting it back. The only way to put put back all of the original energy would be to take ALL of the kinetic energy from the car. But then it wouldn't move.
Generators don't provide energy from nowhere. You may not notice but the generators make the car decelerate once the engine stops pushing it. It's this resistance that is converted directly into electricity. Since you barely notice it slowing the car, it's easy to tell there's not much energy there so it's not enough to totally recharge the car.
That's how car batteries work now. But they don't have enough energy to move an entire car.
They could salvage some of the kinetic energy to prolong its charge but it is nowhere near enough to keep the battery completely charged. It would defy the first law of thermodynamics, you can't get something for nothing
It's like the battery is providing some energy. The generators are siphoning some of that and putting it back. The only way to put put back all of the original energy would be to take ALL of the kinetic energy from the car. But then it wouldn't move.
Generators don't provide energy from nowhere. You may not notice but the generators make the car decelerate once the engine stops pushing it. It's this resistance that is converted directly into electricity. Since you barely notice it slowing the car, it's easy to tell there's not much energy there so it's not enough to totally recharge the car.
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Title Post: Building an electric car for school?
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