A loudspeaker
That's called a speaker.
current signal into light energy
A microphone is a device that converts sound energy into electrical energy. Sound waves cause a diaphragm in the microphone to move, which then generates an electrical signal that represents the sound.
An incandescent lightbulb is an example of a device that converts electrical energy into light and heat. A loudspeaker is a device that converts electrical energy into sound.
A speaker is the device that converts electrical energy into sound energy. An electrical signal is sent to the speaker, which causes a diaphragm to vibrate and produce sound waves that we hear as sound.
microphone
A microphone is a device that converts sound energy into electrical energy.
No, a violin does not transform electrical energy into sound energy. Instead, sound is produced on a violin by the vibrations of the strings when they are bowed or plucked. The sound waves are then amplified and projected by the body of the violin.
Yes, a phonograph captures sound waves and transforms them into mechanical energy to make recordings. The earliest recording device of this type was invented by Thomas Edison.
A radio receiver transforms electrical energy to acoustic energy
An electric drill transforms electrical energy (from a power source) into mechanical energy (for drilling). Other examples of devices that transform energy include a stove (electrical to heat energy) and a radio (electrical to sound energy).
Phonograph