Absolute encoder: Determines the angular position of a shaft or rotating body in its 360° angular displacement as opposed to incremental encoder.

AC circuit: Any electrical circuit with alternating current as the energy source.

Active high: Two-state logic device (e.g., true and false, on and off, high and low) that acts (executes its function) when it is in a high state, as opposed to being active when in the low state.

Active level: The (high or low) level in which a logic device functions.

Active low: Implying that the active level for a device is low, as opposed to active high.

Active power: The portion of electric power in AC circuits that converts to heat or mechanical work (like the work by a motor). It is also called true power ...

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