Question

Who invented the dynamo?
1. Abraham Derby
2. Davy
3. Faraday
4. James Watt

Answer 1

Hint:
Dynamo is the original name of Electric generator.
Michael Faraday showed that one way of inducing the current was to move the electric conductor while the magnetic source stood still, which was the principle behind his disk dynamo.

Complete answer:
A dynamo (or electric generator) is a device which converts the energy of motion to that of an electric current.
The concept goes back to Michael Faraday (1791-1867). He was the son of a poor blacksmith. At the age of 14, Faraday began to assist a bookbinder, where he taught himself by reading books brought to be rebound.
At the age of 21, Faraday got a ticket by one of the customers, to see the leading scientist ‘Humphry Davy’ demonstration on the marvel of electricity. This was the turning point of his life, and that of society’s at large.
In Davy's lecture, Faraday bound a book that eloquently inked the scientist’s theories. Davy got impressed by this gesture, and he hired the young Faraday as his apprentice.
Michael Faraday got famous for his brilliant insights and his popular lectures and soon rose to become Britain's foremost scientist.
Faraday made the discovery that when a magnet is moved next to a closed electric circuit, or when the magnetic field passing through it is changed, an electric current could be "induced" to flow in it. This "electromagnetic induction" is the underlying principle behind electric generators, transformers and many other devices.
Faraday showed that another way of inducing the current was to keep the magnetic source still while moving the electric conductor. This was the principle behind his disk dynamo, which consists of a conducting disk spinning in a magnetic field.
Dynamo is the original and old name for Electrical Generator that Michael Faraday invented, the First Laboratory models of Electric Generator or the ‘Dynamo’ in 1831.

Option (A) Abraham Derby: This option is incorrect. He derived a method to produce pig iron in a blast furnace by using coke as fuel rather than charcoal.

Option (B) Davy: This option is incorrect. He was a chemist and an inventor who is known for isolating elements by using electricity, and thus invented a new field of study, ‘Electrochemistry’.

Option (D) James Watt: This option is incorrect. He was a chemist, mechanical engineer and an inventor who invented the Watt Steam Engine in 1776.

Thus, the correction answer is option 3. Faraday


Note:
Michael Faraday in 1833 published the “Faraday's laws of electrolysis”, which are quantitative relationships based on the electrochemical research.
He was the first scientist who described the quantitative aspects of the Laws of Electrolysis.