Physics › Section Q · Electromagnetic induction and AC circuits › Topic Q.4
Transformers and electrical safety
Transformers let the grid raise voltages for efficient long-distance transmission and lower them again for your home, all with no moving parts. Induction also sits inside the devices that make household wiring safer, from the earth wire to the ground fault circuit interrupter.
In this topic
- Two coils, one core
- The turns ratio
- Power in, power out
- Worked example: a phone charger
- Worked example: stepping up for transmission
- From power station to outlet
- The three-wire system
- Ground fault circuit interrupters
- Worked example: why breakers do not protect people
- Common mistakes to avoid
- Key takeaways
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