I am a 3rd year student at engineering faculty of Dumlupinar University Engineering. I have an investigation in the field of Piezoelectricity and I have a few responsibilities to you. Is the production cost of the Piezo material more than the cost of solar panels or wind roses? And I see pressure as a material that produces electricity, but the tension it produces is always kept in sight. In short, how many amps does the current value I want to produce correspond to? If you make it back, I'm glad. Thank you.