Multimeter and rock drill: what they have in common

1. Step 1. Multimeter — uses — Electrical resistance. Measuring resistance.
2. Step 2. Electrical resistance — is used in — Photoresistor. Light changes the resistance.
3. Step 3. Photoresistor — is part of — Street light. Switching on at dusk.
4. Step 4. Street light — is part of — Tunnel. Lighting.
5. Step 5. Tunnel — uses — Rock drill. Driving the Mont Cenis tunnel.

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