NCTI Installer Technician CH. 1 Questions And Answers Rated 100% Correct!!

Why do only the outer electrons leave their orbit shells? - Answer-because electrons farthest from the nucleus are more easily freed from their orbits due to a weaker electrostatic force. What is required to have a balanced (or stable) atom? - Answer-electrons must equal the number of protons List the capacity of each of the first four orbital shells of an atom. - Answer-2,8,18,32 What is the maximum electron capacity of a valence shell? - Answer-maximum of eight electrons Electrons in orbits nearest the nucleus contain _________ energy than those in more distant orbits. - Answer-Less What will happen to a valence electron that has enough energy added to it? - Answer-valence electron that has enough energy added to it will move away from its atom. What major factor determines which category a particular element belongs? - Answer-The number of electrons in the valence shell How many valence electrons are there in a good conductor? - Answer-only one or two valence electrons List gold, silver, and copper in the order of best conductivity - Answer-Silver,Copper,Gold How many valence electrons are in a semiconductor? - Answer-4 Name the two types of electron current flow. - Answer-Random drift and directed flow are the two types of electron current flow. What causes electrons to be knocked loose and travel randomly from one atom to another? - Answer-The movement of atoms in materials that are conductors and the agitation as they collideWhat can force electrons to all move in the same direction? - Answer-Applying a negative charge to one end of the wire and a positive charge to the other How does the speed of electric current compare to that of electron travel? - Answer-electric current (186,000 miles per sec.) is much faster than electron travel ( a few hundred miles per second) How many electrons are in one coulomb? - Answer-6.28 × 1018 electrons What is the basic measurement unit of electron current? - Answer-The ampere Name the three terms that are used interchangeably to refer to the force that causes current flow. - Answer-Potential difference, electromotive force(EMF) , and voltage Define electromotive force. - Answer-Electromotive force is the electrical force that motivates electrons to move in a wire. What does the term potential difference mean? - Answer-difference between the electrical individual potentials of two points. Define a volt in terms of current and resistance. - Answer-One volt is the amount of force required to produce a current of 1 ampere through a resistance of 1 Ω.