Electrical Engineering › Section A · Introduction, current, and voltage › Topic A.3
DC supplies, conductors, and insulators
A circuit needs something to push charge and something to carry it. This topic surveys the common dc sources, from batteries to bench supplies, and explains why some materials carry current freely while others block it almost completely.
In this topic
- What a dc supply does
- Cells, batteries and chemistries
- Ampere-hour ratings
- Worked example: running time
- Generators, power supplies and solar cells
- The bench power supply
- Worked example: a split supply
- Conductors
- Insulators
- Worked example: energy stored in a battery
- Common mistakes to avoid
- Key takeaways
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