Final answer:
A flashlight exemplifies the law of conservation of energy by converting chemical energy from batteries into electrical energy and then into light and heat energy, demonstrating how energy changes form while the total remains constant.
Step-by-step explanation:
The law of conservation of energy is beautifully illustrated by a flashlight. Inside the flashlight, energy is stored in the form of chemical energy within the batteries.
When the flashlight is turned on, this stored chemical energy is converted to electrical energy as the current flows through the flashlight’s circuitry.
Then, the electrical energy is transformed into light and heat energy as it powers the light bulb, emitting light into the surrounding environment.
The flashlight thereby exemplifies how energy can change forms — from chemical to electrical to light and heat — yet the total energy remains constant within an isolated system, adhering to the conservation of energy principle.