Considering Ohm's Law, which states that the current (I) through a conductor between two points is directly proportional to the voltage ( V) across the two points and inversely proportional to the resistance (R) of the conductor, how does this relationship explain the behavior of electrical circuits in both series and parallel configurations? Additionally, how do variations in voltage and resistance impact the current in practical applications, such as household wiring and electronic devices, and what safety considerations must be taken into account to prevent overloading and potential hazards?