What is a common practical application of Ohm's law?

Ohm's law states that voltage (V) is equal to current (I) times resistance (R), expressed as V = I × R. This fundamental principle of electrical engineering has multiple practical applications.

Calculating battery life involves using Ohm's law to determine how long a battery can power a device based on its voltage, the current drawn by the device, and the internal resistance of the battery. By understanding these relationships, a technician can estimate the duration a battery will last under specific load conditions.

Predicting resistance change applies to various scenarios such as temperature effects on conductors. Ohm’s law allows for the understanding of how resistance varies with temperature, which is crucial for designing circuits that maintain performance in varying environmental conditions.

Assessing energy consumption in devices also relies on Ohm's law. By knowing the voltage applied to a device and the current it draws, one can easily calculate the power consumption (P = V × I), allowing for efficient energy management and cost analysis.

The breadth of application illustrates the fundamental nature of Ohm's law in practical electrical engineering, confirming that each choice presented is indeed a valid application of the principles that Ohm's law embodies. Therefore, the selection encompassing all these uses is comprehensive and accurate.