Overview
This lecture explains electrical conductivity and compares the conductivity of different materials using a simple circuit experiment.
Electrical Conductivity
- Electrical conductivity is the ability of a material to conduct electricity.
- Materials can be tested for conductivity using a circuit with a bulb, cell, wire, and switch.
Conductors and Insulators Experiment
- Connecting wood to the circuit does not light the bulb, showing wood is a poor conductor (insulator).
- Connecting a paper roll does not light the bulb, so paper is also a poor conductor.
- Connecting iron to the circuit lights the bulb, proving iron is a good conductor.
- Other metals like copper and silver also light the bulb, showing they are good conductors.
Summary of Findings
- Most metals are good conductors of electricity.
- Materials like wood and paper are poor conductors of electricity.
Key Terms & Definitions
- Electrical conductivity — the ability of a material to conduct electricity.
- Conductor — a material that allows electricity to flow through it easily.
- Insulator — a material that does not allow electricity to flow through it easily.
Action Items / Next Steps
- Review examples of conductors and insulators from textbook.
- Practice setting up a simple circuit to test materials’ conductivity.