Q 01/05

In what year did Georg Ohm publish the treatise setting out Ohm's law?

A) 1781

B) 1799

C) 1815

D) 1827

Answer · why

D) 1827

Henry Cavendish had found the same relationship in 1781 but never published; Maxwell revealed his notes in 1879. Kirchhoff later reformulated the law ...

Q 02/05

Which Italian chemist built the first continuous-current battery and published his experiments in 1799?

A) Alessandro Volta

B) Antonio Pacinotti

C) Galileo Ferraris

D) Luigi Galvani

Answer · why

A) Alessandro Volta

His pile of zinc and copper discs enabled the electrolysis of water within a year and Humphry Davy's isolation of sodium, potassium and calcium soon a...

Q 03/05

The Leyden jar, invented independently in 1745-46, was the original form of which component?

A) The resistor

B) The capacitor

C) The transformer

D) The inductor

Answer · why

B) The capacitor

Ewald Georg von Kleist and Pieter van Musschenbroek of Leiden both stumbled on it. It stores charge between conductors on the inside and outside of a ...

Q 04/05

In which year did Michael Faraday discover electromagnetic induction?

A) 1810

B) 1820

C) 1826

D) 1831

Answer · why

D) 1831

His lab diary for 28 October records experiments with the Royal Society's great magnet. Joseph Henry found the same effect independently in America at...

Q 05/05

The SI unit of inductance is named after which American scientist?

A) Joseph Henry

B) Charles Steinmetz

C) Elihu Thomson

D) Benjamin Franklin

Answer · why

A) Joseph Henry

A coil has one henry of inductance when a current changing at one ampere per second produces one volt across it. He discovered induction independently...