Explain the concert of drainage system in building​

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

What are similarities and differences of reflection, refraction, diffraction and absorption?

This is the substance(s) formed in a chemical reaction.