What is the specific role of the generator inside a wind-up radio?

It acts as the primary storage device, holding energy in a coiled spring.

It converts mechanical motion into electrical energy.

It amplifies the sound waves produced after electricity reaches the speaker.

It directly transforms the potential energy from the spring into sound.

The operation of a wind-up radio, from winding the crank to powering the speaker, is a clear real-world demonstration of which fundamental scientific principle?

The law of universal gravitation, which primarily governs the attraction between masses.

The principle that energy can be transformed from one form to another within a system.

The theory of special relativity, which describes the relationship between space and time.

The concept of nuclear fission, where the nucleus of an atom is split to release energy.

The speaker would convert stored electrical energy into sound waves without any interruption.

The device would be unable to store energy from the crank's motion for later use.

The generator would fail to convert kinetic energy into electrical energy, even if it was spinning.

The radio would still work perfectly as long as the crank is turned very fast.