How to calculate how much acetic acid should be theoretically yielded from a process that is 75% efficient and actually yields 500.0 ml (assume the density of acetic acid = 1.05 g/ml)

How long could you survive without electricity? what parts of your life would be affected by loss of electricity? should you prepare for an electricity outage, and if so, how would you prepare? what backup system could your family or community install to generate limited amounts of electricity during an outage? how does this system create an electric force field and generate electric current?