Презентация на тему "Ohm’s lawsolving the problems"

Содержание

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  Ohm’s LawSolving the Problems

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  The Interesting World of Numerals

  Do you know that ... resistance* of the man’s skin usually changes from 1 kOhm (for wet skin) to 500 kOhms (for dry skin). The resistance of the other parts of the body equals from 100 to 500 Ohms. ____________________________________________ *resistance - сопротивление

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  Cardinal NumeralsSolve the problems and read them.

  1,203+41= 859-602= 618:6= 3,550x5= 12x12= 37:37= 1000:25= Use these words and phrases:

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  Ordinal Numerals

  one – the first four – the fourth two – the second five – the fifth three – the third six – the sixth twenty-one – the twenty-first fifty-seven – the fifty-seventh

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  Number the months of the year ...................... October .................... April ...................July .................. September ................... January .................... March ................... June .................. November ................... February .................... May .................. December .................... August

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  Common and Decimal Fractions

  ½ - one half (a half) 0 point nine 1/3 – one third (a third) 0.9 nought point nine 2/7– two sevenths zero point nine 3 ½ -three and a half 7 1/7 – seven and one seventh 5 3/7 – five and three sevenths 0.002 – zero point two zeros two 83.97 – eighty-three point nine seven 1.1 – one point one

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  The Interesting World of Numerals

  Do you know that Ohm’s law in which the scientist gave his complete theory of electricity appeared in 1827, but it was recognised by The Royal Society with its award of Copley Medal only in 14 years in 1841.

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  Ohm’s Law

  V R=IResistance equals voltage divided by current V I=RCurrent equals voltage divided by resistance V=IR Voltage equals current times resistance New words current –электрический ток resistance –сопротивление voltage –напряжение law - закон

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  George Ohm

  Born 16 March 1789 Erlangen, Brandenburg-Bayreuth Died 6 July 1854 (aged 65) Munich, Kingdom of Bavaria Residence Brandenburg-Bayreuth, Bavaria Nationality German Fields physics (electricity) Institutions University of Munich Alma mater University of Erlangen Doctoral advisor Karl Christian von Langsdorf Known for Ohm's law Ohm's phase law Ohm's acoustic law Notable awards Copley Medal (1841)