just-an-illusion, please read everything I'm writing:
Amps x volts = watts.
Watts are a unit of power.
Watt hours are a unit of energy.
Energy (and thus power, because energy is power over any certain period of time) cannot be created or destroyed.
Energy can only be converted. While in this conversion process, energy is lost, typically in the form of heat.
Your idea of "stepping up the power" cannot be done. If you are plugged into a 110 volt outlet at 15 amps you are drawing (15 x 110) 1650 watts.
A "step up converter" can step up either volts or amps, at the expense of the other.
If you wish to step up voltage, amps would have to be sacraficed. So let's say you "stepped up" the power coming out of the outlet in favor of volts. Let's say this converter turned the 110 volts @ 15 amps into 220 volts @ 7.5 amps.
If you multiply the two, you still get 1650 watts either way. There is no such thing as a converter that can put out more power than it takes in, because that would mean it is creating energy. And energy cannot be created or destroyed, only converted.'
Now, if the energy coming out of a converter is exactly same total as coming in, why even bother "stepping up" the voltage or amperage. (But remember, that these are only stepped up at the expense of the other becuse the total energy has to be the same)
Well, for some reason I don't know, a wire running with high amps and low volts is very inefficient. That's why the amperage is usually far lower than the voltage.
But what if you want to be inefficient, and you want your wires to produce so much heat that they melt their plastic covering? This is very stupid of course, but if you really wanted to dot his then you would take your converter and make it take the 110volts @15amps and turn it into 15 volts @ 110 amps.
It's the same energy, but for some reason high amps/low volts behaves very differently from low amps/high volts. High amps is very inefficient.
Now, on the other hand, high voltage is very efficient. That's why the electricity running through high-power lines in your neighborhood is extremely high voltage and very, very low amperage.
Now, in an electric car, why would you want to step up voltage? Well, as I've always been told, roughly, in an electric motor, the following happens: more voltage = higher rpm and more amperage = more torque.
In an electric vehicle, the motors are more efficient at higher voltage (and thus at higher rpm) In many hybrid vehicles, there is a transformer that turns the energy coming out of the batteries into very high voltage. Why? Because higher voltage is more efficient.
You should watch some videos on youtube about electricity. Just put in "electricity basics" and you'll get a bunch of informative videos. I watched these two videos a long time ago and I remember liking them.
YouTube - Basic electricity 1/2 and
YouTube - Basic electricity 2/2
And here's a little extra info about something I'm not 100% sure about.
(Voltage is the "pressure" between negative and positive. Amps is the rate at which electrons move. The following I'm not sure about: I think since amps is the movement of electrons, that means it creates more friction within the wire than voltage, so that's why amps is less efficient. Someone correct me if I'm wrong.)