Energy quiz
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Which car turns the biggest share of its energy into motion?
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More questions about Energy
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which invention would break the law of conservation of energy?
Answer: Perpetual motion machine
Why: The US patent office rarely asks inventors for a working model, except when someone claims a perpetual motion machine.
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What share of a filament bulb's energy becomes visible light?
Answer: About 5%
Why: Most of the rest leaves as invisible infrared radiation, the heat you feel near a lit filament bulb.
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How much mass does the Sun turn into energy each second?
Answer: About 4 million tonnes
Why: The Sun's core fuses about 600 million tonnes of hydrogen each second, and the 4 million tonnes that go missing leave as energy.
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What kind of energy does a charged battery store?
Answer: Chemical
Why: No spare electrons are stored: for every electron leaving one terminal of a battery, another enters at the other.
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About how much energy does lifting a small apple 1 meter take?
Answer: 1 joule
Why: The newton is the trap: a 102-gram apple weighs about 1 newton, and raising that weight 1 meter takes about 1 joule.
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How high could the energy that warms water by 1 °C lift it?
Answer: About 430 meters
Why: That is why water falling 100 meters can warm by only about a quarter of a degree, even if all its energy turns to heat.
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