কার নীতি অনুসারে সর্বপ্রথম ডায়নামো নির্মিত হয়েছিল ?
The original "dynamo principle" of Wehrner von Siemens or Werner von Siemens referred only the direct current generators which use exclusively the self-excitation (self-induction) principle to generate DC power. The earlier DC generators which used permanent magnets were not considered "dynamo electric machines". The invention of the dynamo principle (self-induction) was a huge technological leap over the old traditional permanent magnet based DC generators. The discovery of the dynamo principle made industrial scale electric power generation technically and economically feasible.
After the invention of the alternator and that alternating current can be used as a power supply, the word "dynamo" became associated exclusively with the "commutated direct current electric generator", while an AC electrical generator using either slip rings or rotor magnets would become known as an alternator.
Wehrner von Siemens