What does RPM stand for?
AnswerRevolutions per minute
RPM counts how many full turns a shaft makes each minute.
Vehicles · Facts & stats
Motor facts & stats
7 fact-checked facts about motors and engines, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Electric motors rely on the interaction of electric current and what?
AnswerMagnetic fields
Current in a wire within a magnetic field feels a force, which motors use to spin.
Going deeper
In a four-stroke engine, which stroke comes right after compression?
AnswerPower
The cycle is intake, compression, power (combustion) and exhaust.
How does a diesel engine ignite its fuel?
AnswerUsing heat from highly compressed air
Diesel engines squeeze air until it is hot enough to ignite injected fuel, with no spark plugs.
In an electric motor, what is the stationary part called?
AnswerStator
The stator stays still while the rotor spins inside or around it.
Expert level
Who coined the term 'horsepower'?
AnswerJames Watt
James Watt used horsepower to compare his steam engines' output with the work of horses.
Which type of engine uses a triangular rotor instead of pistons?
AnswerWankel rotary engine
The Wankel engine's rounded triangular rotor spins in an oval-like housing to complete its cycle.
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