Here is a helpful article I found that will help you when it comes to opening your Electrical Service Panel. Just remember, be careful not to remove the panel cover because you could be exposed to dangerous wires.
From Article: Located inside or outside of your home is a circuit breaker panel (sometimes called a fuse box) that contains circuit breakers for each of the circuits in your home. Some homes have more than one circuit breaker panel, there may be a main panel plus one or more sub panels in other locations.
Caution: Please read our safety information before attempting any testing or repairs.
A circuit breaker provides protection for each of your electrical circuits by stopping the flow of current if an overload or fault occurs. When an electrical fault occurs or the load on your circuit becomes too great, the breaker on that circuit trips and interrupts the flow of current to that circuit. A tripped circuit breaker is still sometimes referred to as a “blown fuse” in reference to the older technology that circuit breakers replaced. If your home uses an actual fuse and not a circuit breaker, click here for information on fuse boxes…. Read more