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Blackboard inscribed with scientific formulas and calculations in physics and mathematics

The World Science Festival’s Pioneers in Science

Illustration of molecules. (molecular, chemistry, science)

Why Is a Group of Molecules Called a Mole?

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5 Quizzes That Will Tell You Whether You Should Have Been a Scientist

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History of Technology Timeline

Binary Computer Code, Binary Code, Internet, Technology, Password, Data

How Does Wi-Fi Work?

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7 Puzzling Plane Disappearances

Normandy Invasion: Omaha Beach. World War II. D-Day. Infographic. SPOTLIGHT VERSION

Facts and Figures About the Landings on Omaha Beach During the Normandy Invasion on June 6, 1944

Estimated battle casualties, Normandy invasion, World War II. WWII, D-Day

Estimated Battle Casualties During the Normandy Invasion and Campaign to Liberate Paris (June–August 1944)

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Why Are Some Time Zones 30 Minutes Off Instead of an Hour?

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Nostradamus and His Prophecies

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10 Great Sports Rivalries

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ampere: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Last Updated: May 27, 2025

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Topics

electric current International System of Units unit kilogram mole second metre kelvin candela metric system astronomical unit calorie week

Quiz

Electric power lines against sunset (grid, power, wires, electrical, electricity)

Energy & Fossil Fuels

battery. Illustration of battery connected to lightbulb. Power a light bulb with a battery. Battery, Power Supply, Science, Circuit, Currents

Electricity: Short Circuits & Direct Currents

barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure

Fun Facts of Measurement & Math