Transformer and power line in code

You will write three small functions about a transformer and a power line.

The idea. For an ideal transformer the voltages are in the ratio of the turns. The efficiency is the power out divided by the power in, as a percentage. A line that carries the power $P$ at the voltage $V$, with power factor $1$, has the current $P/V$ and loses $I^2r$ as heat. All the values are in SI units.

Your tasks.

1. In secondary_voltage, return the voltage of the secondary coil in volt.
2. In efficiency, return the efficiency in per cent.
3. In line_loss, return the heat in the line in watt.