Rheostat and rope: what they have in common

1. Step 1. Rheostat — uses — Electrical resistance. More resistance means less current at the same voltage: that is how a rheostat controls the current.
2. Step 2. Electrical resistance — is used in — Joule heating. The heat released depends on the conductor’s resistance and the current.
3. Step 3. Joule heating — uses — Conservation of energy. Joule measured the mechanical equivalent of heat.
4. Step 4. Conservation of energy — is used in — Yo-yo. Potential → kinetic energy.
5. Step 5. Yo-yo — has part — Rope. A thread.

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