Hello, and good day.
So, let me give you some background info first. My friends commercial refrigerator's temperature sensor is busted, so the refrigerator is permanently "off". He circumvented this with a quick hack which required him to bypass output power to the input. This is great because his refrigerator works, but now it will never shut off, freezing everything. The solution was to use an Arduinio and a relay to alternate the flow of power (chosen because these are the parts at hand).
If you take a look at the image I made (it sucks, I know), you can see a crude deception of whats going on. But, before I go any further, I would like to make sure that you all understand that when the circuit is complete, i.e. the power flows from each side of the bypass, that everything is OKAY.
The relay allows me to interrupt that flow of power by sending voltage from the Arduinio. So, from what I stated above, when the circuit is complete (not interrupted) everything should work fine. Yet, what I don't know is what is going on with the electricity when the flow is interrupted. My hypothesis is that the relay would overheat, but I am not sure and thats why I am here.
To restate, when the flow of electricity is interrupted (stopping at the relay), how can I make a ground if one is necessary. Can you all give me some insight on whats going on?
Sorry, but I am bit of a newbie. If I left something out, or if I used the wrong terminology, then I apologize. If you have any questions, ask them, and I will get back to you as quickly as possible.