Answer and Explanation:
This energy would be electrical energy, specifically, static electricity. Static electricity occurs when a body that is charged with particles is transferred to another body. This is known an imbalance of electric charges because it's necessary to establish a balance of charges between two bodies or surfaces. In this case, the door knob is charged with a negative charge, ie electrons. When a person touches this door knob, the electrons are transferred to its body and that's why this experiences a shocj.