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Module 4 - Chapter 9 - Energy, Power and resistance II - Coggle Diagram
Module 4 - Chapter 9 - Energy, Power and resistance II
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Conductors, semiconductors and resistors
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Thermistor
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As temperature of the thermistor increases, the number density of the charge carriers also increases
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Investigating
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A thermistor is selected to ensure it provides the greatest change in resistance over the range of temperatures in which it operates
LDR
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Made from a semiconductor in which the number density of charge carriers changes depending on the intensity of the incident light
In dark conditions, the LDR has a very high resistance as the number density of free electrons is very low
When light shines onto the LDR, number density of charge carriers dramatically increases, leading to a rapid decrease in resistance
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Super conductivity
As some materials get cooler, their resistvitiy drops but at a critical temperature, the resistivity falls to zero
Any components made from a superconducting material have no electrical resistance, no energy is lost when there is current in the material
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