Resistivity and temperature dependence of a wire
Heat different wires in a bath: R = ρL/A and R_T = R₀[1 + α(T − T₀)] for metals, almost constant for manganin, and the exponential fall for a thermistor; fit α from the R–T line.
About this experiment
| Subject | Physics |
|---|---|
| Class | 12 |
| Chapter | 3. Current Electricity |
| NCERT section | 3.6, 3.7 |
| Level | NCERT level |
| Time | about 12 minutes |
| Access | Included in a PractiSci plan |
What you do in the lab
Change the controls and watch the physics behave in real time in 3D. Live readouts and graphs show the numbers behind it, and the Learn tab has the theory, procedure, observations and viva questions. Works on a phone or a laptop, in English and Hindi.
Topics: resistivity · temperature coefficient · thermistor · metals · semiconductors
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- Ohm's law: V–I characteristics
- Potentiometer: emf comparison, internal resistance
- Resistor colour code and series/parallel combinations