Voltage,ohms law, electrical energy dilemma

[noone123]

Homework Statement

I don't understand voltage and electrical energy. So Voltage is power/unit of current. also V=RI. In power lines, the power losses are minimised by using large amounts of voltage. From P=VI, I gets smaller. But ohms law says current will increase. HUH?
Power loss = RI^2, but if V increases, according to ohms law I increases as well? So how does power loss decrease when considering ohms law

Also is voltage and power considered energy, like in the group of kinetic,gravitational,etc?

Homework Equations

P=VI
V=IR
P=RI^2

The Attempt at a Solution

No attempt other than readin stuff online. I've read the water analogy, still doesn't help me.

Thx

 

[da_nang]

In power lines, the current is AC. The current is carried with a high voltage by using a transformer. The voltage and current in a transformer closely follows the relation U₁/U₂ ≈ I₂/I₁, where index 1 and 2 denote the primary and secondary circuits respectively. This comes from the way a transformer works, where the electrical power of the primary and secondary circuits are equal (in ideal situations), or roughly equal (in real situations).

Ohm's law still applies, but since the current has decreased and there's a constant resistance (neglecting increase in resistance due to heat), the power loss P = RI² will be smaller.