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2. Spark-gap transmitter - Wikipedia

   en.wikipedia.org/wiki/Spark-gap_transmitter

   Electromagnetic waves are radiated by electric charges when they are accelerated. [7] [8] Radio waves, electromagnetic waves of radio frequency, can be generated by time-varying electric currents, consisting of electrons flowing through a conductor which suddenly change their velocity, thus accelerating.

3. Samsung Electronics - Wikipedia

   en.wikipedia.org/wiki/Samsung_Electronics

   [67] [68] The product specs posted by Samsung indicate that, in contrast to the premium quality enhanced eReaders launched in 2012 (the NOOK HD and HD+, which "had screens and CPUs comparable to the best mid-level and premium tablets), the more budget-like features of the Samsung Galaxy Tab 4 Nook will be designed for a lower market tier ...

4. Electrical engineering - Wikipedia

   en.wikipedia.org/wiki/Electrical_engineering

   Early on, he sent wireless signals over a distance of one and a half miles. In December 1901, he sent wireless waves that were not affected by the curvature of the Earth. Marconi later transmitted the wireless signals across the Atlantic between Poldhu, Cornwall , and St. John's, Newfoundland , a distance of 2,100 miles (3,400 km).