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GCSE Physics 2020-2022 OCR Gateway

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Question:

So how does Temperature Increases Resistance? [Not always the Case]

Author: eric_galvao



Answer:

-When Electrons go through a Resistor, a Bit of its Energy is given to the Thermal Energy Store of that Resistor, which will Heat it Up. -However Thermal Energy Store is basically the Kinetic Energy Store, so the Heating up of the Resistor also has the Particles Vibrating More. -This Vibration is a Challenge for our Electrons to get Through, making the Current harder to Flow, and the Resistance Increases -Some Resistors do have a Limit of the Current that can Flow. Why? More Current = More Thermal Energy = More Resistance = Less Current -This can Explain the Filament Lamps I-V Graph Levelling off at the High Currents [Or it Broke]


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