A sound amplifier.
Answer.
While electronic amplifiers will amplify sound (we do this all the time), there are also mechanical devices that "direct" the sound and make it sound louder. They don't...
A transistor has three sections, an emitter, base, and collector. By extracting a small number of electrons from the base, a large # of electrons can flow across the transistor from the emitter, thru...
No, you cannot amplify gravity. It is a function of mass, and a certain mass exerts a certain gravity at a certain distance from the center of mass. To increase gravity, you need to increase the mass...