What does Ohm's Law define?

Ohm's Law defines the relationship among voltage, current, and resistance in an electrical circuit. This fundamental principle states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, provided the temperature remains constant. The relationship is expressed through the formula V = I × R, where R represents resistance.

Understanding Ohm’s Law is crucial for fire investigation technicians because electrical systems can be involved in fire origins and developments. For instance, faulty wiring or short circuits can lead to overheating and ignite combustible materials. By knowing how voltage, current, and resistance interact, fire investigators can better assess potential electrical causes of fires and analyze the conditions that may have led to the ignition event.

The other options pertain to different scientific principles and phenomena not related to electrical circuits or Ohm's Law. For example, the first option discusses thermodynamics, while the third option focuses on various fuel types and combustion, and the fourth relates to gas laws in chemistry. These concepts are important in their own contexts but do not define Ohm's Law.