why does we use high volatage and less current when trasmitting electric power?

because heat generated in the wire is equal to (current)^2*time. If current is not low then the tempreture will be very high and it may melt the wire.

also a lot of current is wasted in generating heat !!!!

Think of Ohm's law: \[V = IR\] Also Power = VI. Substitute the first equation into the second, and you get: \[P = I^2 R\] The transmission line (wire) has a given resistance. The lower the current, the lower the power that will be dissipated in the line by heat. This is a direct loss to the power company because it reduces the transmission efficiency. To minimize the current, they maximize the voltage. So the reason they transmit power using as high a voltage as possible is to maximize their efficiency and profits. :-)

so as to overcome the large amount of the power which is transmited .think of ohm`s law

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