H)What was the reason for the war of currents?Disagreement with Edison over direct current versus alternating current

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Before you start

1 You are going to read about life and work of the American inventor, Nikola Tesla. Before you read the text answer the following questions.

A)What field of science did he work in? electrical engineering

a) What is he famous for? alternating current

Reading

1 Pay attention to the correct pronunciation of the following words.

Croatia	[ krɔu´eI∫Iə ]	coil	[ kɔIl ]
Serbian	[´sə:bIən ]	magnetic	[ mæg´netIk ]
Roentgen	[´rɔntgən ]	induction	[ In´dʌk∫n ]
Niagara	[ naI´ægərə ]	turbine	[´tз:baIn]
Austria	[´ɔstrIə ]	remote	[ rI´məut ]
direct	[ də´rəkt ]	robotics	[ rəu´bɔtIks]
alternating	[´ɔltəneItIŋ ]	X-ray	[´eks reI ]
polyphase	[ pəlI´feIz ]	terrestrial	[ tə´restrəIl ]
control	[ kən´trəul]	hypothesis	[ haI´pθəsIs]

3 What do these figures refer to?

Tesla registered over 700 patents worldwide

Nikola Tesla came to the United States in 1884 with an introduction letter from Charles Batchelor to Thomas Edison

Tesla lighted 200 lamps without wires from a distance of 25 miles

in 1943 the United States Supreme Court, held Marconi's most important patent invalid, recognizing Tesla's more significant contribution as the inventor of radio technology.

Tesla possessed a striking physical appearance over 6 feet tall

Nikola Tesla was born on July 10, 1856

In 1915, a New York Times article announced that Tesla and Edison were to share the Nobel Prize for physics

He also lighted 200 lamps without wires from a distance of 25 miles

Tesla spent 59 years of his productive life living in New York

4 Look back in the text and make a list of Tesla’s inventions and developments.

induction motor;alternating current; generator; polyphase principle; transformer; electrical motor; wireless communications; wireless transmission of electrical energy; remote control.

5 Read the text again and answer the following questions:

a)What sciences attracted Tesla? electrical engineering

b) Where did he work?In the old Waldorf Astoria Hotel(New York)

c) What was his childhood ambition? Did he achieve it?His childhood dream was to come to America to harness the power of Niagara Falls.

d)How did he come across the idea of induction motor? Once when Tesla was demonstration of the "Gramme dynamo" (a machine that when operated in one direction is a generator, and when reversed is an electric motor), he visualized a rotating magnetic field. With a stick, he drew a diagram in the sand explaining to his friend the principle of the induction motor.

e) What device did Tesla conceive and design first?Induction motor.

f) Did European manufacturers get interested in it?No.

g) What advantages did alternating current have over/versus direct current? Direct current flows continuously in one direction; alternating current changes direction 50 or 60 times per second and can be stepped up to vary high voltage levels, minimizing power loss across great distances.

h)What was the reason for the war of currents?Disagreement with Edison over direct current versus alternating current

i) What invention did Tesla consider his most important one?alternating current

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