The 19th century was a very prolific era of discoveries of electrical knowledge and technologies that laid the foundations for modern electrical communications. During this period, the foundations of modern electrical technologies were discovered. The 19th century began with a debate between Luigi Galvani and Alessandro Volta regarding the source of electricity used in Galvani's famous frog experiment. These debates lead to Volta's invention of the battery, and Volta's invention of the battery. Volta's discoveries would pave the way for Ohm's law several years later. However, before this discovery, Hans Christian Ørstead discovered electromagnetism, which was later used by André Marie Amperè to show that magnetism is electricity. Following the publication of Ohm's Law, Faraday would publish his findings on induction in the 1830s. During the same decade, the direct current generator and transformer were invented, followed in the 1840s by the invention of the alternating current generator. Communication technologies have advanced at an incredible pace. Sömmering would design the first multi-line telegraph, and Morse would perfect it into a practical single-wire design. The work of Charles Wheatstone in telegraphy and Heinrich Hertz in wave theory paved the way for modern communications. Alexander Graham Bell invented the telephone in 1876. Èdouard Branly provided a detector which allowed the invention of the radio. Guglielmo Marconi and Alexander Stepanovich Popov will develop the first radios. From the invention of the battery to the first intercontinental transmission of telegrams, advances in electrical technologies in the 19th century made possible the technological boom of the 20th and 21st centuries in communications...... middle of paper ... ...ambridge University Press on behalf of the British Society for the History of Science, The British Journal for the History of Science, Vol. 1, No. 1 (June 1962), pp. 31-48, [Online] Available: http://www.jstor.org/stable/4025073[9] Joost Mertens, Shocks and Sparks: The Voltaic Pile as a demonstration device, The University of Chicago Press on behalf of The History of Science Society, Isis Vol. 89, no. 2 (June 1998), pp. 304 [Online] Available: http://www.jstor.org/stable/237757.[10] Herbert W. Meyer, A History of Electricity and Magnetism, Massachusetts Institute of Technology, 1971, pp. 39, 73, 100, 201.[11] Richard Wolfson, University Physics Second Edition, Pearson, 2012, pp. 453, 454.[12] Dan M. Worrall, David Edward Hughes: Concertinist and Inventor, Papers of the International Concertina Association, Allan Atlas, ed., vol. 4. 2007, p... 4.