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Free Electricity quiz: 81 trivia questions and answers β volts, amps & Ohm's law. Easy to hard, with explained answers. No sign-up.
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From the War of the Currents to superconductivity, this quiz explores the great discoveries and workings of electricity. A fun way to test your scientific knowledge.
This quiz currently has 81 questions, ranging from easy to hard, available in French, English and Spanish when the Spanish translation is available.
Warm up before the quiz with these 16 trivia questions and their explained answers: click a question to reveal the answer.
Answer: The volt. The volt (V) measures the electrical potential difference between two points in a circuit; it is named after Italian physicist Alessandro Volta.
Answer: The ammeter. The ammeter is connected in series within a circuit to directly measure the current flowing through it.
Answer: Kilowatt-hour. The kilowatt-hour (kWh) corresponds to the energy consumed by a one-kilowatt device running for one hour; it is the unit used on electricity bills.
Answer: The relationship between voltage, current, and resistance (U = R Γ I). Formulated by Georg Ohm in 1827, this fundamental law relates voltage (U), resistance (R), and current intensity (I) in an electrical circuit.
Answer: Break in the event of an overload to protect the circuit. A fuse contains a wire that melts when the current exceeds a defined threshold, interrupting the circuit to prevent overheating, fire, or destruction of components.
Answer: The photovoltaic effect. The photovoltaic effect, discovered by Edmond Becquerel in 1839, allows certain semiconductor materials, such as silicon, to convert light directly into electric current.
Answer: It converts electrical energy into mechanical motion using magnetic forces. An electric motor exploits the interaction between a magnetic field and an electric current to produce a force that spins its shaft.
Answer: Linky. It transmits consumption remotely, so no meter reader needs to visit. Gazpar is its equivalent for gas.
Answer: U = I x R. Formulated by Georg Ohm in 1827, this law relates voltage (U), current (I), and resistance (R) in an electrical circuit: U = I x R.
Answer: The transformer. The transformer uses two magnetically coupled coils to step up or step down an alternating voltage, a principle essential to electricity transmission.
Answer: Intensity spikes sharply. A short circuit creates a path of very low resistance, causing a sharp spike in current that can damage the installation or start a fire.
Answer: Thales of Miletus. Around 600 BCE, Thales of Miletus noticed that rubbed amber attracts small light objects, one of the earliest known observations of static electricity.
Answer: The conversion of electrical energy into heat within a conductor. Discovered by James Prescott Joule in 1841, this effect explains why a current-carrying conductor heats up, a principle used in electric heaters and toasters.
Answer: Direct current (DC). Thomas Edison championed the direct current he had developed, opposing the alternating current promoted by Nikola Tesla and George Westinghouse, which eventually prevailed for power transmission.
Answer: Several hundred million volts. A lightning bolt can reach several hundred million volts and carry a current of tens of thousands of amperes, releasing enormous energy in a fraction of a second.
Answer: 1946. After the war, over a thousand small companies were merged. EDF then built the country's dams and nuclear fleet.
65 more questions are waiting for you in the quiz!