Ignition coil and electric fan: what they have in common

1. Step 1. Ignition coil — is part of — Internal combustion engine. The coil supplies high voltage to the spark plugs.
2. Step 2. Internal combustion engine — is part of — Jet ski. An engine.
3. Step 3. Jet ski — has part — Water-jet propulsion. A water jet.
4. Step 4. Water-jet propulsion — has part — Impeller. An impeller.
5. Step 5. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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