Today, humankind is completely dependent on energy. Energy is indispensable for growth and life on Earth, and it is also of key importance for living comfortably – for heating, lighting, cooling, ventilation, operation of machines and appliances, for transport, etc. The major energy-generating source is the sun, sending the energy to Earth and making life on our planet possible. This energy is free of charge and without negative effects. However, we only know how to use and convert a small ...