Operational amplifier and oil well: what they have in common

1. Step 1. Operational amplifier — uses — Feedback control. Feedback sets the gain.
2. Step 2. Feedback control — is used in — Engine control unit. Control based on sensors.
3. Step 3. Engine control unit — is part of — Internal combustion engine. An engine control unit.
4. Step 4. Internal combustion engine — uses — Petrol. The fuel of a petrol engine.
5. Step 5. Petrol — is made of — Crude oil. Petrol is made from crude oil.
6. Step 6. Crude oil — uses — Oil well. Oil is extracted from wells.

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