22.3 – Investigating the Effect of Temperature on Resistance (Leaving Cert Physics): Flashcards

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22.3 – Investigating the Effect of Temperature on Resistance
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What property does temperature affect in these experiments?

Electrical resistance

2 materials in temp-resistance experiments

Metallic conductors & thermistors

Metallic conductor: resistance vs temp trend

Increases linearly

Thermistor: resistance vs temp trend

Decreases exponentially

Metallic conductor: graph shape (RR vs TT)

Linear

Thermistor: graph shape (RR vs TT)

Curved/exponential

Why metallic resistance increases with temp

Atoms vibrate more, impede electrons

Why thermistor resistance decreases with temp

Semiconductor allows more current when heated

Metallic conductor temp coefficient type

Positive

Thermistor temp coefficient type

Negative

State needed before taking initial readings

Thermal equilibrium

Error source: rapid heating causes

Temp changes faster than can be measured

Safety: keep ohmmeter away from

Hotplate

Thermistor practical applications

Temperature sensors, digital thermometers, HVAC systems

Equipment difference in thermistor experiment

Thermistor replaces wire coil

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