Mass can be converted to energy in some very special cases, but no general method to convert any mass directly into energy is known.
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Transducer is a device which converts one quantity in to another quantity........... Mostly we are using electrical transducers. That converts physical quantity in to electrical quantity. Transducers enables us to measure the physical quantity. Also they are employed in the sensors too.
An electric doorbell uses electrical current thru a coil to move a metal bar using magnetism and cause it to strike a metal plate making a ring sound
By using photo electric emission phenomenon.
A generator produces electrical energy by harnessing mechanical energy and using that to rotate coils in a magnetic field.
Both dc generator & dc motor are the same and known dc machine.when we give an electrical supply to the dc machine a torque developed due to flux intraction & works as motor.but we used dc machine as a generator we rotate the rotor or prime mover by using external sourse.due to this the rotor conductors cut by the stationary magnetic field and electrical power is generated as per faradays law.Here the main difference is when we giving electrical energy to the rotor of dc machine produce torque(motor)but when we give the mechanical energy to rotor it produce electrical energy(generator)