GENERAL KNOWLEDGE

Detailed explanation-1: -In 1886 Frank Julian Sprague invented the first practical DC motor, a non-sparking motor capable of constant speed under variable loads.

Detailed explanation-2: -During a six-decade career, Sprague developed the electric railway, early electric elevators, and the commercial electric motor. Born in Milford, Connecticut, Sprague graduated from the U.S. Naval Academy in 1878.

Detailed explanation-3: -1886 – The invention of the DC motor William Sturgeon invented the first DC motor that could provide enough power to drive machinery but it wasn’t until 1886 that the first practical DC motor that could run at constant speed under variable weight, was produced.

Detailed explanation-4: -After many other more or less successful attempts with relatively weak rotating and reciprocating apparatus the German-speaking Prussian Moritz Jacobi created the first real rotating electric motor in May 1834 that actually developed a remarkable mechanical output power.