10 mA is enough to stop a persons heart, or burn muscle tissue.
With regards to peak current, this is correct, but only occurs twice per cycle.
Zero occurs 3 times per cycle and other values between Zero and Peak occur 4 times per cycle, hence we have RMS values.
The 690v I assume is the rms value, the peak will be 1.414 x 690.= 975.6v.
So if you take PEAK values of 975.6 / 600 = 1.626 amp = 1626 mA
Which ever way, you are probably dead.
Ray;mond's answer is best because he takes into account the AC nature of the voltage. Ohm's law should really only be used for DC circuits, at least where homework problems like this are concerned. Either that, or you need to know the frequency of the AC and the reactance of the human body at that frequency.
Amps = volts divided by ohms = 690/600 = 1150 milliamps, RMS times 1.416 = 1626 milliamps peak.
i = v/r
so 690/600 = 1150 mA
