The voltage at the 90-degree point of a sine wave with a maximum voltage of 10 V is ____.

In a sine wave, the voltage varies periodically and can be represented mathematically. The 90-degree point on a sine wave corresponds to the peak of the waveform, specifically, this is where the sine function reaches its maximum value of +1. Therefore, if the maximum voltage of the sine wave is 10 V, then at the 90-degree phase angle, the value of the voltage will also be at its peak, which is +10 V.

This is a fundamental characteristic of sinusoidal waveforms employed frequently in AC power sources, where the voltage oscillates between positive and negative values. At the 0-degree point, the waveform starts at 0 V, rises to +10 V at 90 degrees, returns to 0 V at 180 degrees, goes to -10 V at 270 degrees, and finally returns to 0 V at 360 degrees, completing one full cycle.

Thus, at the 90-degree point, with the sine function reaching its maximum amplitude, the voltage is indeed +10 V, aligning perfectly with the sine wave’s inherent properties.