Here's some ideas that I've had recently. I'm always coming up with far fetched ideas that may or may not be feasible.
Both these have to do with cars.
1. Gizmodo posted about this electric car that travels for 250 miles on a single charge. So, I was thinking, if there's an electric motor that controls the rear wheels, the front wheels are just spinning along. Why not hook up a generator powered by the rotation of the front wheels that recharges the batteries. Then, after the initial charge, this thing would go forever. Of course I'm not a mechanic so feel free to poke holes in my theory.
2. This second idea is one I've had for awhile. I think to some extent some luxury cars have installed proximity sensors into cars for parking, but I was thinking why not use electro magnets to create a buffer around cars.
Basically charge all cars so they're all positve (or negative). Like charges repel so there would never be any accidents as cars would have this magnetic field around them. At stop lights only the first car needs to break. Other cars can come up full speed with out breaking and would be stopped by the magnetic field of the car in front. Then when the lead car pulls away the cars behind automatically go ahead.
This would really increase the flow of traffic as you wouldn't need any distance in front of you and would eliminate what I call the domino effect at stop lights, which is the lead car takes a second to realize the lights green and then go, the car behind him takes another second and so on, so it's at least 10 seconds before the 10th car in line even starts to move after a light change (provided everyone's on the ball).
Of course, like I said I'm not a mechanic, so feel free to poke holes in my ideas or tweak them.
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The rotation of the wheels to charge would result in a resistance that would drain the batteries too strongly. What some cars do however is that they use the braking system to recharge the batteries as well.
The car that people need to start buying (and that the government needs to start giving more incentives for) is the hybrid cars.
Those cars in which the batteries have a small motor to charge them as you drive. This type of engine uses little gas and therefore gives little emission. On top of that you can go forever without charging because the engine does that for you and you can reach much faster speeds that typical battery powered cars.
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