1. I read such calculation that 1.5 cm copper wire is sufficient to conduct 100 kW of electric power at reasonable voltage.
Why powerfull electric motors use tons of copper wires to operate?
Or magnetic field power depends on lenghts of wires regardless of current density?
What is sense to use lot of thin wires instead of thicker and shorter?Whould it not be
easier to manufacture?
Why car electric motors such as in Toyota Prius use high voltage motors?
Maybe it`s safer to use high current under small voltage,exacly like car starters do?
What is a way to reduce weight of copper and size of electric motor?

2.

3. as far as i am aware it is always the case that higher voltage and low current is more efficient.

high currents produce alot more heat which leads to component damage........

4. The number of turns in the coil and the intensity of the current through the wiring are equally important in producing the motive power of an electric motor. A current in a straight wire produces a magnetic field that travels around the wire. The convention is described as the "right-hand rule" (notice how the thumb and fingers "point" in the diagram below).

The fields of closely wound turns in a coil combine to produce a stronger magnetic field, and thus, more power. It's probably easier to deal with a high number of turns than to produce and manage high currents, as noted by fatman57. The power loss in a conductor is called "IČR loss" because the power lost equals the current squared times the resistance, so you can see how strongly current affects power loss: 10 times the current causes 100 times times the loss.

5. as far as i am aware it is always the case that higher voltage and low current is more efficient
I thought it`s not a case since electric motors are designed to work with high currents and low voltages.There should be no overlooses in wire if it`s thick enough to accomodate such current.Here is mentioned some of this question:
http://www.pcsutilidata.com/lower_voltage
It seems for me a bit contrintuitive that longer wire allows to create stronger magnetic field without putting more energy in it.Isn`t energy stored in magnetic field?
Do exist some way to inforce shorter wire to creat stronger magnetic field and reduce
length of wire?

6. How many kg of copper is used in reluctance motor?
http://en.wikipedia.org/wiki/Reluctance_motor

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