Firefighter 1 Practice Exam 2026 – Complete Prep Guide

Energy exists in distinct forms that we can store, transfer, or convert from one to another. The four forms most broadly used and taught as standard energy types are mechanical energy (energy of motion and position), electrical energy (energy of electric charges and fields), nuclear energy (energy stored in atomic nuclei), and chemical energy (energy stored in chemical bonds). This combination covers the main categories used to describe how systems hold and release energy in physics and chemistry.

Other options mix processes or phenomena with energy terms. Refracted describes light bending, not a type of energy. Fusion and decomposition are processes (nuclear and chemical reactions), not standalone energy forms. Flame refers to combustion behavior, Friction describes a force and energy conversion, and Spontaneous isn’t a form of energy. That’s why the four fundamental energy types listed above are the best match.