How is the instantaneous value defined in the context of electrical signals?

The instantaneous value in the context of electrical signals is defined as the voltage at any specific moment in time. This reflects the real-time voltage level of an electrical signal as it fluctuates, allowing for a precise understanding of the signal's behavior at that particular point. Instantaneous values are foundational in analyzing waveforms, particularly for alternating current (AC) signals, where the voltage continuously changes over time.

By focusing on a specific moment, this definition enables engineers and technicians to measure and analyze the performance and characteristics of electrical circuits more accurately. In contrast, other definitions, such as total average voltage, maximum voltage in a cycle, or voltage required for steady-state, refer to broader concepts that evaluate different aspects of electrical signals rather than pinpointing a single moment in time.