Which of these is the formula for calculating power?

The correct formula for calculating power in an electrical circuit is defined as Power = Voltage x Current. This relationship stems from Ohm's Law, where voltage (V) is the product of current (I) and resistance (R). When you rearrange the formula for power in terms of voltage and current, it becomes evident that if you multiply the voltage across a circuit by the current flowing through it, you get the total power consumed or produced.

This fundamental formula is crucial in various fields, including electronics and electrical engineering, as it helps professionals and technicians understand how much energy is being used or transferred in a circuit. Additionally, knowing how to compute power accurately enables better management of electrical systems, ensuring safety and efficiency.

In contrast, other formulas given do not accurately represent power. For instance, multiplying current by resistance gives you voltage, not power. Simply adding voltage and current does not yield any meaningful electrical measurement. Dividing current by voltage results in a value with units of conductance, which also does not relate to power directly. Thus, the accurate use and understanding of the power formula are essential for effective fire investigation and electrical safety assessments.