What is the voltage at the 270° point of a sine wave with a maximum voltage of 10V?

To determine the voltage at the 270° point of a sine wave, it is essential to understand the characteristics of a sine wave. A sine wave oscillates between its maximum and minimum values, which correspond to specific angles in its cycle, measured in degrees.

At a maximum voltage of 10V, the sine wave reaches its peak value of +10V at 90°, crosses through 0V at 180°, reaches its lowest value of -10V at 270°, and returns to 0V at 360°.

At 270°, the sine wave has reached its minimum point, which corresponds to -1 times the maximum voltage. Since the maximum voltage is 10V, the voltage at 270° is indeed -10V.

This understanding of sine wave behavior throughout its 360° cycle confirms that the correct answer is the lowest point of the sine wave at the 270° angle.