Electrical Safety

Fuses, earthing and RCDs

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Current through the body is what causes harm: tens of milliamps can be deadly.
• Wet skin has much lower resistance, so more current flows.
• Fuses protect wiring; RCDs detect leakage currents and protect people.

Steps

1. It’s the current that hurts
2. Wet hands
3. Choosing a fuse
4. Birds on a wire
5. How much current flows?
6. The life-saving switch