You seem to have jumped to a very high level without understanding the basics. Think of electricity as water, voltage is pressure and current as the amount flowing.
It may be that you understand both of these things far more than I, if so, hopefully someone will be along shortly to answer your question.
However, I will endeavor to answer your question, "hi, guys i m a bit confused with voltages and currents how are they related and affect any electrical device?" - google ohms law.
Mike.