The well runs deep
Trivia questions and answers, drawn fresh from the well
239,757 public questions across 1,818 topics. Challenge yourself, or build the perfect quiz for game night.
239,757
Questions with answers
1,818
Topics to explore
3
Depths of difficulty
Today at the well
1 / 5 0
Which SI unit of voltage is named after Italian scientist Alessandro Volta?
Answer
Volt
What instrument did Benjamin Franklin invent to protect buildings from lightning?
Answer
Lightning rod
Who patented a practical alternating-current transformer in the United States in 1886?
Answer
William Stanley Jr.
Which law says the electric force between two point charges follows an inverse-square relationship?
Answer
Coulomb’s law
What SI unit measures magnetic flux density, named after Nikola Tesla?
Answer
Tesla
0 / 5
Round complete
239,757 trivia questions
Every question has an answer
1,818 public topics
Something for every quiz
Free to explore
Reveal answers at your own pace
Fresh from the well
Latest trivia questions
What instrument did Benjamin Franklin invent to protect buildings from lightning?
Answer
Lightning rod
Who patented a practical alternating-current transformer in the United States in 1886?
Answer
William Stanley Jr.
What is the name of the effect in which a changing magnetic field induces an electric field?
Answer
Electromagnetic induction
Which experiment first measured the electron’s charge-to-mass ratio?
Answer
J. J. Thomson’s cathode-ray experiment
Which scientist discovered radio waves experimentally in 1887?
Answer
Heinrich Hertz
Who built the first practical electric battery in 1800?
Answer
Alessandro Volta
Which law states that the current through a node equals the current entering it?
Answer
Kirchhoff’s current law