Those power lines have a non zero resistance and therefore are subject to Joule heating, which causes transmission loss. The split of power between transmission losses and load energy conveyed to the client can be equated by a voltage partitioner. To minimize transmission losses, the resistance of lives has to be as small as possible, compared to the load.
Line resistance and power supply specifications of consumer appliances are fixed. Joule heating is what happens when a current runs through anything that has resistance. Joule heating also depends upon the amount of current resistance and conducting wire.
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