doubt in domestic current

i have two question

1)voltage coming from our home wall socket is sine wave or sinusoidal wave.my confusion is we use vrms to get it average since average of sin wave is zero that same if there is phase shift it may become cos wave so there is chance for we can call it as sinusoidal wave isnt it?


2) For current to get through ,the ground is need.so if i touch wall socket current with slipper.does current pass through me or if i hang the power wire that going on post(space) without my leg touching ground ,does the current pass through?

1)rms is not average of a signal and sin has zero average but not zero rms(root mean square).
we call both cos and sin signals sinusoidal signal.

The RMS value of an AC sinewave produces exactly the same power into a resistive load (like an electric heater or incandescent light bulb) as a DC voltage at the same voltage. The sinewave voltage goes from 0V up through the RMS voltage then it peaks at a voltage that is the root of 2 (1.414) times higher then it drops past the RMS voltage and passes through 0V to go the other polarity, over and over.

2) The local mains normally comes from a big transformer. It comes with two wires "Live" and "Neutral", t the transformer the neutral id earthed. In your house you will have a live and a neutral and perhaps an incoming earth. if you do not have an incoming earth then you have a local earth spike, driven into the soil.
If you touch the earth wire , nothing will happen, it does not have any voltage on it at all.
If you touch the neutral wire then, you might have a tiny voltage on it , say up to 6V AC, this is not enough to harm you.
If you touch a live, then you have 230V AC, trying to drive current through your body down to earth. If this current exceeds 20 mA or so it will kill you. So it all depends on the resistance between your body and the local earth.
Frank