think this is a magic trick.
Give equations connecting heat loss due to higher voltage and higher current for same power supply
How about you actually do your homework yourself, and then ask us if we think you've done it right?
It's Ohm's law. You can look up the formula. Basically, you square current and multiply by resistance. So if you raise voltage, you lower current, and lower power loss by a factor of current squared. In other words, there is a logarithmic reduction in power loss when you increase voltage.