The bell circuit: extra-low voltage
Electrical Technology · Grade 10 · about 40 minutes
How a bell transformer works, why the bell side is safe to touch, and how the two voltages are kept apart.
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- 6 sections of explanation, worked examples and diagrams
- 1 practice task with hints and worked answers
- A quiz that marks itself as you go
- Your progress kept across every subject you take
Other lessons in this sub-strand
- Final circuits
- From the consumer unit: naming final circuits
- One-way lighting circuit
- Two-way lighting
- Intermediate switching
- Socket-outlet (power) circuits
- Radial and ring final circuits
- The cooker circuit
- Water-heater and heating circuits
- The bell circuit: extra-low voltage
- Standard electrical symbols
- Layout diagrams and circuit diagrams
- Cable size and colour
- Preparing a bill of materials
- The tools requisition
- Installing a lighting circuit
- Installing a socket circuit
- Testing a final circuit
- Regulations governing final-circuit work
- Why final circuits are needed