Need questions so we can answer it
Cultural environment, hope this helps ;)
Never
If safe turn the power connection off at the supply source e.g the power box where the main switches are. But do not attempt to turn the power off st the powerpoint switch (the source in which the electrical hazard is coming from).
Even after the power has been disconnected you shouldnt touch the person immediately after.
Answer: There is no fundamental difference
Explanation:
There is no fundamental difference between visible light and invisible light such as radio waves and X rays. They are all electromagnetic waves that differ in only one way: their wavelength.
