Difficulty: Easy
Correct Answer: Electric motor (direct-current)
Explanation:
Given data
Concept / Approach Davenport built one of the earliest practical DC electric motors (1830s) and received a US patent for it, demonstrating rotary motion from electric current.
Option analysis Electric motor (DC): Correct. Telegraph: Samuel Morse and others. Telephone: Alexander Graham Bell. AC induction motor: Nikola Tesla and later developments.
Final Answer Electric motor (direct-current).
Discussion & Comments