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I think selenium was such a thing that was used for old fashioned photocopiers. The cylinder was charged electrostatically, then exposed to the image of the paper being copied. The areas exposed to light became conductive and lost their charge. The toner had the opposite charge and would the stick to the black areas. This would then be put onto a new piece ...


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Yes. Whether the result is a good conductor depends on how localized electrons and holes in the respective bands are (or, saying the opposite phenomenologically: on their mobility). Their recombination time limits for how long you will have even just two charge carriers available for conduction. This tends to make such conduction very energy-inefficient ...


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Bring an electron close to a positron (anti-electron) and you will see the 2*mc^2 converted in energy. The fact that you don't see it in electronics or electrical circuits is because the positive and negative charges are withheld in different type of particles that will not annihilate when they meet. Otherwise our material world would be very unstable.


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A conductor is made of neutral atoms, which has equal numbers of protons and electrons. The protons and some of the electrons are fixed. But some of the electrons, the "valence" electrons, can move freely in the conductor. Eletrons repel each other, so they tend to spread out as much as they can without leaving the conductor. If you add extra electrons, ...


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EMF is the total voltage that can be supplied by a source of electrical energy (e.g. battery/dynamo). Basically, it encompasses both the voltage that will reflect in the circuit and the voltage that is constantly used up to overcome the resistance r of the component itself. Voltage is equivalent to work done per charge (V= W/q), this applies to EMF as work ...


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The emf of the battery causes a potential drop across the circuit due to the chemical reactions inside the battery. When a charge gets to the positive end of the battery(remember that in reality,in most cases it is the electrons that flow in a circuit and are moving from the negative end to the positive end of the battery) they get attracted by that positive ...



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