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Physics — Petrol Engine Energy Flow

Only about a quarter of the fuel energy reaches the wheels.

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Petrol engine: energy flowFuel chemical energy100Useful work (wheels)25Exhaust heat40Cooling system30Friction and sound5Conserved — 100 in, 100 out, across 5 nodes and 4 flows. The widths add up.5 nodes named only by a flow — `Fuel chemical energy`, `Useful work (wheels)`, `Exhaust heat`, `Cooling system`, `Friction and sound`. They are drawn under th…Conserved: 100 enters at `Fuel chemical energy` and 100 leaves at `Useful work (wheels)`, `Exhaust heat`, `Cooling system`, `Friction and sound`, and every on…

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title "Petrol engine: energy flow"
flow "Fuel chemical energy" "Useful work (wheels)" 25
flow "Fuel chemical energy" "Exhaust heat" 40
flow "Fuel chemical energy" "Cooling system" 30
flow "Fuel chemical energy" "Friction and sound" 5