What does Ohm's Law express?

Ohm's Law articulates the foundational relationship between voltage, current, and resistance in an electrical circuit. It states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. This relationship is commonly expressed in the formula ( V = I \times R ), where ( V ) represents voltage, ( I ) is the current, and ( R ) is the resistance. Understanding this relationship is crucial for fire investigators, particularly when analyzing electrical circuits involved in fire incidents, as it helps to identify potential electrical failures that could lead to ignitions.

The other options involve different physical laws or principles: one describes the relationship between power and energy, another connects mass and acceleration (Newton's second law), and the last pertains to the fundamental concepts governing heat and energy transfer. These do not pertain to the electrical principles that Ohm’s Law addresses.