If this is somehow not a joke, allow me to explain. Firstly: no, our bodies are not powered by electicity, signals to and from our brain are. For example: when you move your arm, your brain sends a signal to the muscles in your arm, telling them what to do. Its still the musckes that do the action, just the signal telling them how to do it. Secondly: this electricity is increadibly weak. Most lightbulbs have much much more electricity than what is in your body. It is so low that not only is it not a danger to us, we don't even notice it. And finally: you seem to have no understanding of how electricity works. If we had a potentially lethal dose of electricity in our bodies, it wouldn't kill us when we shower, it would kill us as soon as we can into contact with anything. Side note: the reason the electricity doesn't leave our bodies is the same reason you don't get shocked if you tounch a phone charger that's plugged in. The electric current is naturaly isolated in our bodies.