رامین توحیدی مدرس و مترجم زبان انگلیسی

English Article about Solar Energy Solar radiation may be converted directly into electricity by solar cells (photovoltaic cells). In such cells, a small electric voltage is generated when light strikes the junction between a metal and a semiconductor (such as silicon) or the junction between two different semiconductors. The power generated by a single photovoltaic cell is typically only about ...

What is Friendship? Friendship is defined as a bond of affection between two people. People are referred to as best friends if the friendship is really strong. This relationship is characterized by positive interpersonal qualities such as kindness, generosity, loyalty, and honesty. True friends choose to be with one another, enjoy time spent together, and can engage in a positive ...