There are more than one type of loud speaker but the most common is a coil of wire suspended in a magnetic field. When alternating currents are passed through the wire, resulting vibrating magnetic fields push and pull against the permanent magnet. The coil is connected to a surface, usually conical, which moves back and forth because of this pushing and pulling causing sympathetic sound vibrations in the air adjacent to this surface which then move away as sound waves.
A loudspeaker has a coil that is attached to the speaker's cone. The electrical signal from the amplifier goes through this coil. This signal current produces a magnetic field in response to the signal. There is a permanent magnet also at the back of the speaker. The magnetic field from the coil either pushes or pulls in relation to the magnetic field in the permanent magnet, causing a mechanical motion of the speaker cone, producing sound pressure changing when the cone moves the air around it.
An electromagnet pulls a piece of iron attached to a diaphragm (the speaker cone).
Thus a change in the current flowing in an electrical circuit causes a movement of the air ... which we call hearing.
It converts electrical signals into vibrations of a diaphragm.
The related link below explains this very well.
One is the hydrophone, used to pick up sound waves underwater.
In principle, yes, but you wouldn't want to wait around to do the job that way. Human ears are very sensitive, and the sounds around you carry very little energy compared to the energy used by common electrical gadgets. One or two watts of pure tone from a loudspeaker will drive you out of the living room, and the "ear buds" are blasting no more than a few milliwatts of sound power into your ear canals. You could hang a microphone out of your window, and use the sounds of traffic as you drive. It might charge your cellphone in a couple of weeks ... if you leave the phone turned off and don't use it.
IF you use speaker as microphone, you can use it as a transducer to convert soun energy into electrical signals
Capacitive sensors are used mainly to detect proximity, usually that of people. The operating principle is that the capacitance of the capacitor varies as material comes between the two plates of the capacitor, and you can determine the presence of something via the measurement of the capacitance.
today the general rule of thumb is that if the pressure sensor has a millivolt (e.g. 30mV or 100mV) or non-amplified output it is a pressure transducer. If the pressure sensor has a voltage (e.g. 0-5Vdc, 0-10Vdc or 1-5Vdc) output it is an amplified voltage output pressure transducer. If a pressure sensor has a current loop output (e.g. 2 wire 4-20mA or 3 wire 0/4-20mA) it is a pressure transmitter. Simply we can tell as Transducer: Any physical Quantity is converted into Electrical Signal. Transmitter: to make the amplified RF electrical signal to radiation with help of Electric and maganetic signal.
I guess that machine will be a loudspeaker.
loudspeaker of telephone: electrical to sound energy microphone of telephone: sound to electrical energy
radio you convert a electrical sound wave into a sound wave
They both convert between electrical impulses and sound waves. The microphone converts sound waves into electrical impulses and the loudspeaker converts electrical impulses into sound waves.
A loudspeaker is a transducer that converts electrical energy to sound energy.
A loudspeaker
Sound - vibrations in the air.
Sound is usually an acoustical wave in air. When this is converted e.g. by a microphone to an electrical voltage that can be sent through a wire. An amplifier and a loudspeaker can convert this audio signal back to an acoustical wave, you can listen to.
Amplification.
they produce electrical enery which turns into vibrations
We can convert electrical energy into mechanical energy in mixer and grinder. We can convert electrical energy into sound energy in various sound systems. We can convert electrical energy into heat energy in electric water or room heater.
Two step process: First convert heat to electrical and then cpnvert electrical to sound....