Final answer:
The true statement about energy is that according to the conservation of energy, the total energy of an isolated system remains constant, even though it can change form.
Step-by-step explanation:
Understanding the Conservation of Energy.The statement concerning energy that is true is that the total energy is constant in any process. Energy is defined as the ability to do work and is measured in joules. According to the law of conservation of energy, energy can neither be created nor destroyed. It can change from one form to another, but the total energy of an isolated system remains constant. For example, kinetic energy, which is energy due to motion, can be converted to potential energy, or vis versa, but the sum of both will remain unchanged in an isolated system.
An essential principle to recall is that no matter how energy is transformed or transferred, the total amount of energy in the universe remains constant. This principle is known as the conservation of energy, which is a fundamental concept in physics.