>i can hear my outletsThis should not happen. An electrical engineer such as myself knows little about how electricians perform their work, but I promise you now, you probably don't need one. I am sorry if this is not what you want to hear, but that humming is probably a light fixture, a lamp, or something else, maybe even something wrong with your ears. Please, let me explain. The two top holes in your outlet differ by 120 volts. The current alternates between its high and low points sixty times a second. If they produced a hum, it would be a 60 hz sound, specifically a sine wave. Go here and listen for youself:
https://onlinetonegenerator.com/the default setting is a sine wave, but change the number to 60 Hertz. Also, turn the volume down. It's somewhat loud, especially if you select sawtooth or square.
>i always wonder if the current messes with my bodyIf the electrical current from your outlets was flowing through your body, believe me, you would KNOW. you would also be dead already. If what you mean to ask is "is there something coming out of the outlets which can harm me" the answer is no, the electric fields and magnetic fields produced from outlets connected to devices are extremely small, when nothing is connected, it is but a time-varying electric field that generates a small magnetic field. Good luck detecting it.
Leakage would cost money, you would notice this in your bill.
>can I stop the flow by using theseThe flow is already stopped, you see. There are three holes, the bottom is called "neutral", it runs to a wire that digs into the earth - larger appliances use this for safety, if there's a big malfunction, the power will flow to ground safely as the device turns itself off or breaks itself instead of the power flowing through the case of the appliance. One of the two other holes has positive voltage, the other has negative, and power only flows if they are connected (say, through a device such as a household appliance).
