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For an electric buzzer, it's electrical energy.
take two cells a buzzer and a light join the buzzer with wire and the light bulb with the buzzer and the cell
Mechanical and sound energy.
yes
Les Paul is credited with creating the solid body electric guitar. One of the more famous models made by Gibson Guitars still bears his name.
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1837
No, just trim it down with an electric buzzer or scissors
When you press the button, an electric current is connected, making a strong buzzing noise and/or light.
Alexander Fleming
The classic "buzzer" uses an electromagnet as do non-electronic doorbells. The electric current is used to create a magnetic field that attracts a steel diaphragm in the buzzer. As it moves, the diaphragm pulls open the circuit and falls back to its starting position, which powers the magnet again to repeat the cycle. Depending on the circuit, several dozen motions and disconnects every second by the steel diaphragm are what create the buzzing sound.