primary voltage = number of turns on primary
secondary voltage = number of turns on secondary
used on the national grid:
to transmit a lot of power, need high voltage or current
high current -> loss of power (as heat) -> resistance of the cables
cheaper -> voltage up to 400,000 V -> current very low
transformers step up the voltage at one end for efficient transmission, and steps it down at the other end, to safe usable levels
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