Transformation of mechanical energy into heat energy in daily life I'll use it in class in an hour

Transformation of mechanical energy into heat energy in daily life I'll use it in class in an hour

Generators, diesel engines, etc. in power plants

In our daily life, we will see the phenomenon that mechanical energy is transformed into heat energy. Please give us an example,

There are too many examples. Just care about your life. Mechanical energy is the sum of kinetic energy and partial potential energy. Here potential energy is divided into gravitational potential energy and elastic potential energy. The kinetic energy is determined by mass and velocity; the gravitational potential energy is determined by height and mass; the elastic potential energy is determined by stiffness coefficient and shape variable

The main energy conversion of loudspeaker is ()
A. Mechanical energy into electrical energy B. electrical energy into mechanical energy C. thermal energy into electrical energy D. electrical energy into thermal energy

The loudspeaker is mainly composed of coil, permanent magnet and cone-shaped paper basin. When the alternating current passes through the coil, the magnetic field will change and interact with the permanent magnet to produce vibration, which drives the paper basin to vibrate back and forth to make the loudspeaker produce sound and convert the electric energy into mechanical energy

Energy conversion: nuclear energy is converted into electrical energy, then into internal energy, then into mechanical energy, and then into electrical energy
Write down the device for energy conversion

Nuclear power plant, kettle, steam engine, generator