Ammeter and saw: what they have in common

1. Step 1. Ammeter — uses — Electromagnetism. Current in the coil creates a magnetic field, and the needle turns further the larger the current.
2. Step 2. Electromagnetism — is used in — Starter motor. A starter is an electric motor.
3. Step 3. Starter motor — evolved from — Crank. It replaced the starting crank.
4. Step 4. Crank — is part of — Sawmill. A crank turns the wheel’s rotation into the stroke of the saw.
5. Step 5. Sawmill — uses — Saw. The cutting tool is a saw.

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