Physics › Section O · Current and circuits › Topic O.2
Ohm's law, resistance, and resistivity
Connect the same battery to a copper wire and to a strip of rubber and you get wildly different currents. Resistance explains the difference, and it depends both on what a conductor is made of and on its shape and temperature.
In this topic
- Push and opposition
- Ohm's law
- Worked example: a toaster element
- Resistivity: material and shape
- Conductors, semiconductors, insulators
- Worked example: a length of copper wire
- Resistance and temperature
- Worked example: a platinum thermometer
- Common mistakes to avoid
- Key takeaways
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