Pin hole or blow hole defects are the same problem caused by the printed board outgassing during wave soldering.
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Electrical current is the flow of charged particles. It is similar to flow of water molecules in a river. AC and DC are ways of flow of current an electrical circuit.
Potential difference can be simply defined as the difference of electrical potential between two points. When two positive charges when brought close to each other, they repel.
Electric current is the flow of electric charge (charged particles) through a conductor with respect to time. The process is similar to flowing of a river in one direction.
During our school days, we all studied in science that atoms are made up of 3 particles – electrons, protons, and neutrons.