by kublikhan » Wed 23 Jan 2008, 18:44:21
$this->bbcode_second_pass_quote('dub_scratch', ' ')Is it really more efficient when you consider the energy losses when burning of coal at the powerplant and transmitting the electricity to the EV? Comparing efficiency that way does not make the EV much better than the ICE.
EV's are much more efficient when you consider the whole picture. The electrical transmission system is about 95% efficient. The storage battery is about 88% efficient. The electric motor is 90% efficient. Producing power at a large plant like a coal power plant is always more efficient than producing power at a small plant, like a ICE. Easier to catch pollution as well. Contrast this with the ICE engine. Where about 25% of the energy in the gasoline is turned into torque. Add in idling, braking, and various other inefficiencies and you are lucky to get out 10% of the energy in the gasoline, not even talking about the energy it took to refine and pump the oil. A typical driver who spends between $150 - 200 on gasoline would only spend $10-20 in electricity for the same mileage.
Source:
http://answers.yahoo.com/question/index ... 922AAWkoys$this->bbcode_second_pass_quote('dub_scratch', ' ')With the crisis we face, it would be much better to ponder whether of not it is wise to have masses of individuals push around 3,000 lb (or less) metal boxes over long distances, as a daily habit. Given the fact that such a system and culture is inherently an energy squandering enterprise, the answer is clearly NO.
I would tend to agree with you here. For pushing around people and goods I think trains and ships are better options, not cars and planes.