Who invented the modern vacuum cleaner and patented a motorized floor-cleaning machine in 1901?
Answer
Hubert Cecil Booth
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Who invented the modern vacuum cleaner and patented a motorized floor-cleaning machine in 1901?
Answer
Hubert Cecil Booth
Who invented the marine chronometer that solved the longitude problem at sea in the 18th century?
Answer
John Harrison
What electrical device did William Sturgeon demonstrate in 1825 using a coil of wire around an iron core?
Answer
Electromagnet
Which electromagnetic phenomenon makes a compass align with Earth’s magnetic field?
Answer
Magnetic torque
In electrostatics, what is the SI unit of electric dipole moment?
Answer
Coulomb-metre
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Latest trivia questions
Which electromagnetic phenomenon makes a compass align with Earth’s magnetic field?
Answer
Magnetic torque
In electrostatics, what is the SI unit of electric dipole moment?
Answer
Coulomb-metre
Which physicist discovered the electron in 1897 through cathode-ray experiments?
Answer
J. J. Thomson
In electromagnetism, what is the SI unit of magnetic field strength H?
Answer
Ampere per metre
Which scientist discovered that a compass needle is deflected by an electric current in 1820?
Answer
Hans Christian Ørsted
What device uses a semiconductor junction to emit light when electric current passes through it?
Answer
Light-emitting diode
Which scientist demonstrated in 1752 that lightning is electrical using a kite experiment?
Answer
Benjamin Franklin