some of the applications which i think are:
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high voltage is used for testing of motors such as lightning impulse test,surge test etc...
Power transformers can be used for power transformation. Voltage transformers are not suitable for high power applications.
the inductive load which is generally use in high voltage transmission line known as transformer. the transformer transform the high voltage to low voltage.
That's a pretty good question. In computers a change in voltage level is usually the data signal. There are many industrial applications where a change in current is used as a signal. In fact ANY change in voltage or current can be used. Data signals are very weak (high impedance) compared to power supply voltage and currents.
voltage is termed as electrical pressure. when high voltage is applied more is the movement of electrons. hence losses will be less. this is one of the major reason for which high voltage transmission is chosen.secondly due to high voltage the current will be less so as the conductor size
at high voltage side, current is low. hence the size of conductors is reduced or small. At low voltage side, current is high. Hence the size of conductors is large.