What is the SI unit of energy?
AnswerJoule
Energy is measured in joules; a watt is one joule per second.
Science · Facts & stats
Energy facts & stats
7 fact-checked facts about energy sources, energy science and saving energy, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which of these is a renewable energy source?
AnswerWind
Wind is replenished naturally; fossil fuels take millions of years to form.
Going deeper
A kilowatt-hour is a unit of what?
AnswerEnergy
A kWh is the energy used by a 1 kW device running for one hour.
What fuel do most nuclear power plants use?
AnswerUranium
Most reactors split uranium atoms to release heat.
Kinetic energy is the energy of what?
AnswerMotion
Any moving object has kinetic energy.
Expert level
One small calorie equals about how many joules?
Answer4.184
The thermochemical calorie is defined as 4.184 joules.
The Three Gorges Dam, the world's largest hydropower plant by capacity, is in which country?
AnswerChina
It spans the Yangtze River in Hubei Province.
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