What is a common application of a Triac?

A Triac is commonly used for motor speed control due to its ability to regulate power in AC circuits. It functions effectively as a switch that can be turned on and off at different points in the AC waveform, allowing for precise control of the amount of power delivered to a motor. By adjusting the point in the waveform at which the Triac is triggered, the average voltage and hence the speed of the motor can be varied.

This feature is particularly useful in applications where speed control is critical, such as in fans, pumps, and various other electric motors. The ability to vary power in this way results in energy savings and improves operational efficiency, making Triacs a popular choice for these applications.