Semi-conductors
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| What is a semi conductor? | A substance whose resistivity is between that of a conductor and an insulator and whose resisitivity decreases as its temperature increases
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| What are conduction electrons? | Valence electrons with enough thermal energy to break its covalent bonds
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| At what temperature is silicon an insulator? | Near zero kelvin
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| What are holes? | The gap left when an electron breaks free of a covalent bond
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| What is intrinsic conduction? | Conduction in a pure semi conductor due to electrons moving from negative to positive with an equal number of holes moving in the opposite direction
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| What is a thermistor? | A semi conductor whose resistance decreases rapidly with increasing temperature
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| What is a light dependent resistor? | A semi conductor whose conductivity is increased when light shines on it
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| What is doping? | Adding small controlled amounts of impurities to a pure semi conductor to increase its conductivity
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| What is an N-TYPE semi conductor? | An N-TYPE semi conductor is a conductor with an impurity added which increases the number of electrons available for conduction
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| Name an example of an N-TYPE semi conductor | Silicon and phosphorous
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| What is a P-TYPE semi conductor? | A P-TYPE semi conductor is a conductor with an impurity added which increases the number of holes available for conduction
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| Name an example of a P-TYPE semi conductor | Silicon and Boron
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| What is extrinsic conduction? | Increased conduction in a semi conductor due to the addition of impurities
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| What is a P-N junction? | A semi conductor with one end doped P-TYPE and the other doped N-TYPE
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| What is a depletion layer? | A depletion layer is a region in a P-N junction diode where no mobile charge carriers are present which behaves as an insulator
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| What is junction voltage? | The potential difference across a P-N junction caused by holes and electrons moving across the junction when its formed
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| What is a forward biased P-N junction? | One that conducts current. With the positive terminal connected to the P-TYPE
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| What is a reverse biased P-N junction? | One that doesn't conduct current with the negative terminal connected to the P-TYPE
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| Why is current in a forward biased P-N junction very small at a low voltage? | It must first exceed the junction voltage
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| Name to uses of P-N junctions | Rectification of A.C
Integrated circuits
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JackEatonK98
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