Verified Answer :

Final answer:

The component that rotates when you turn a key in a lock is the cylinder plug. The cylinder body and escutcheon do not rotate, as they serve different functions. Therefore, the correct answer is the cylinder plug.


Explanation:

Understanding Lock Mechanisms

When you turn a key in a lock, it primarily interacts with the cylinder plug. The cylinder plug is the part that rotates within the cylinder body and is directly influenced by the key. Here's a breakdown of the components involved:

  1. The Cylinder Plug: This is the part that rotates when you insert and turn the key. Its movement allows the lock to open or close.
  2. The Cylinder Body: While it stays stationary, it surrounds the cylinder plug and houses the locking mechanism. It does not rotate when the key is turned.
  3. The Escutcheon: This is the decorative cover that surrounds the keyhole. It also does not rotate and is primarily for aesthetic and protective purposes.

Thus, the correct answer to the question is the cylinder plug. The cylinder body and the escutcheon remain stationary during this action.


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