Which energy transformation sequence correctly describes a flashlight powered by a battery?

• A. Chemical → Mechanical → Light
• B. Electrical → Light
• C. Mechanical → Electrical → Light
• D. Chemical → Electrical → Light

Answer: (D)

A flashlight that runs on a battery starts with chemical energy stored in the battery. When you switch it on, that chemical energy is converted into electrical energy in the circuit, and the bulb then uses that electrical energy to emit light energy (with some waste heat). So the energy transformation sequence is chemical energy → electrical energy → light energy. The other sequences try to skip the initial chemical source or introduce a mechanism (like mechanical energy from cranking) that isn’t part of a standard battery-powered flashlight, which is why they don’t describe how this device actually works.