Which describes energy transformation from chemical to electrical to light energy?

• A. A bolt of lightning flashes during a storm.
• B. A candle glows as it burns.
• C. A wind turbine produces power for lights.
• D. A flashlight uses a battery to operate.

Answer: (D)

Energy moves through this chain when a device first uses stored chemical energy, which is then converted to electrical energy and finally into light energy. In a flashlight, the battery holds chemical energy. When you switch it on, that chemical energy changes to electrical energy that flows through the circuit and powers the bulb, and the bulb converts that electrical energy into light (with a bit of heat). That sequence—chemical energy to electrical energy to light energy—is exactly what this item is illustrating.

The other scenarios don’t follow that same sequence. A candle turns chemical energy directly into light (and heat) without an electrical stage. A wind turbine uses the wind’s kinetic energy to generate electricity, but there isn’t a stored chemical energy source involved in the immediate transformation. A bolt of lightning is an electrical discharge, not a chemical-to-electrical-to-light transformation inside a device.