Identify an example of energy being transformed.

Identify an example of energy being transformed.

• A. A light bulb turning electrical energy into light and thermal energy.
• B. A battery never changes energy.
• C. Water evaporating without energy use.
• D. A rock at rest.

Answer: (A)

Energy transformations happen whenever energy changes form. A light bulb shows this clearly: electrical energy from the power source is converted into light energy that we see and thermal energy that makes the bulb and surroundings warm. That change from electrical to light (and heat) is exactly an energy transformation. The other ideas aren’t good examples. A battery does change energy—from chemical energy to electrical energy when it delivers power—so the statement that it never changes energy isn’t accurate. Water needs energy to evaporate, so it doesn’t occur without energy input. A rock at rest isn’t transforming energy unless it moves or interacts, so there’s no energy change happening there.

Energy transformations happen whenever energy changes form. A light bulb shows this clearly: electrical energy from the power source is converted into light energy that we see and thermal energy that makes the bulb and surroundings warm. That change from electrical to light (and heat) is exactly an energy transformation.

The other ideas aren’t good examples. A battery does change energy—from chemical energy to electrical energy when it delivers power—so the statement that it never changes energy isn’t accurate. Water needs energy to evaporate, so it doesn’t occur without energy input. A rock at rest isn’t transforming energy unless it moves or interacts, so there’s no energy change happening there.