The device that is electromechanical among the options provided is the power drill.
A power drill typically combines electrical components (like a motor) with mechanical parts (like gears and drill bits) to perform its function. The other options, while they may contain mechanical aspects, do not have electrical components that make them electromechanical. The abacus is purely mechanical, the hammer is a hand tool with no electrical components, and the handheld screwdriver usually refers to a manual tool, though there are electric models that would be electromechanical.
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