In ,
Sam E typed:
On Wed, 7 Apr 2010 12:51:57 -0700 (PDT), harry
wrote:

On Apr 7, 3:51?pm, Ivan wrote:
On Apr 7, 8:36?am, "
wrote:

AC was adopted in the US because its easy to transport,
stepping up and down voltages to send current cross
country.

thomas edison prefered DC, thinking it was safer

Thomas Edison preferred DC because he built his power
system on DC and AC was developed by a competitor (Tesla,
working for Westinghouse).

AC is in fact more dangerous. When you say 120 volts AC,
that is only the RMS voltage (a kind of average) The peak
voltage is nearly 200volts.

170V

The 120 volts AC will give exactly the same watts output
as 120volts DC if connected to the same resistor. But the
200 volts (peak) is clearly more dangerous.
So Edison was right.

But DC cannot be changed via a transformer so the high voltages necessary to
provide the end-use currents would/could not safely exist. A little more
research would also show you that ac voltages are safer than the DC. DC
clamps and holds the muscles, causing quicker death than ac.
Claims such as the DC hoax postulated here are usually the work of trolls
misinformationists and guessers.