Consider a distribution transformer: The primary winding (HV) has a nominal voltage of 14.4 KV, whereas secondary (LV) has a nominal voltage of 120 V. One terminal from each of the primary and secondary windings is solidly grounded. A HV line (14.4 KV) is connected to the primary. Now, if the HV line is short-circuited with the LV line, what will the voltage be across the secondary windings? According to the book I have, the voltage will not be much larger than 120V. I find this very surprising. After the HV and LV lines are short-circuited, the potential difference across secondary should also have been 14.4KV, not a bit larger or smaller!