$A$ transformer is a device which converts

  • A
    low voltage at low current into high voltage at high current
  • B
    high voltage at low current into low voltage at high current
  • C
    high voltage at high current into low voltage at low current
  • D
    electrical power into mechanical power

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$A$ generator at a utility company produces $100 \, A$ of current at $4000 \, V$. The voltage is stepped up to $240,000 \, V$ by a transformer before it is sent on a high voltage transmission line. The current in the transmission line is ....... $A$.

$A$ transformer operating at primary voltage $8\,kV$ and secondary voltage $160\,V$ serves a load of $80\,kW$. Assuming the transformer to be ideal with a purely resistive load and working on unity power factor,the resistances in the primary and secondary circuits would be:

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