Why Are Electrons, Rather Than Protons, The Principal Charge Carriers In Metal Wires?

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Because one or more electrons from each metal atom are free to move throught the atomic lattice. While protons do not move because they are bound inside the nuclei of atoms
it is what electrical flow is measured in, one ampere is a flow equal to 1 coulomb of charge per second.
Will water flow more easily through a wide pipe or a narrow pipe? Will current flow more easily through a thick wire or a thin wire?
The superconducter needs much lower temperatures for there to be zero resistance than regular conductors

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If the voltage impressed across a circuit is held constant while the resistance doubles , what change occurs in the current?
current is directly proportional to the voltage established across the circuit, and is inversely proportional to the resistance of the circuit. So if the resistance is double the current is halfed…
If the resistance of a circuit remains constant while the voltage across the circuit decreases to half its former value, what change occurs in the current?
Because your overall resistance between you and the pipes in the bathtube that connect you to the ground is so low that the 120 volt potential difference will produce a harmful current in your body
The difference in elecrtical potential between one part of your body and another part when touching a current, it will pass along the path of least electrical resistance between two points.
The third prong is connected directly to th earth so it serves as a grounding device in the e event the live wirey comes in contact with the metal surface of the appliance.
Dc means direct current and refers to the flowing of charges in one direction. A batteris terminals always ahve the same sign adn is Dc because the current runs in the same direction. Alternating Current move first in one direction then move in the opposite direction.
it is a tiny electronic device that acts as a one-way valve to allow electron flow in only one direction.

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