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S01 T01 -D1/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama ELECTRIC UNITS

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S01 T01 -D2/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama The electric principles What are the different electric source you kwnow ?

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S01 T01 -D3/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama There is two sources : Direct current Alternative current The electric principles + - ACCU FLASH 12 V Dynamo Alternateur

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S01 T01 -D4/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Direct current sources are polarized with positive and negative poles Direct current Direct current could be produced by an electrochemical generator like a battery or by a swinging device like a dtnamo or by cells. + - ACCU FLASH 12 V Dynamo

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S01 T01 -D5/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Uses of direct current The direct current is used to supply electric devices like portable electric drills or electric vehicles…

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S01 T01 -D6/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Direct current representation The direction of electrons is always the same

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S01 T01 -D7/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Alternative current sources Un Alternateur produit l’électricité il transforme une énergie mécanique en énergie électrique En général, on utilise la force de l’eau ( centrale hydraulique ) ou de la vapeur ( centrale thermique ou nucléaire ) pour faire tourner une turbine Mais, on peut utiliser la force du vent ( les éoliennes ) We can also use mechanical energy produced by thermical engine, that what we calle a generator.

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S01 T01 -D8/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Alternative current sources The alternative current is generally used for houses and company electrical installations.

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S01 T01 -D9/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Alternative current representation Le Courant Alternatif change de sens périodiquement Une Période se divise en deux Alternances The frequency of alternative current match with the number of period per seconds. The frequency is express in Hertz.

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S01 T01 -D10/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Parallel of water : the Voltage The Voltage is an electric potential difference Is similar to a level difference The Voltage (U) is express in VOLT (V)

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S01 T01 -D11/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Parallel of water : the current intensity (amperage) The Amperage is similar to a throughput The current intensity ( I ) is express in Amp ( A )

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S01 T01 -D12/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Parallel of water : electric resistance The electric resistance is similar to pipes sections The electric resistance ( R ) is express in OHM ( Ω )

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S01 T01 -D13/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Ohm’s law Volatge ( U ), electric resistance( R ) and intensity ( I ) are linked by the Ohm’s law: U = R x I Exercice : What will be the intensity value of a current passing through a 100 Ω device supplied by a 12 V source?

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S01 T01 -D14/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama The units

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S01 T01 -D15/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Units What units are in this light bulb ? Volt watt

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S01 T01 -D16/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Units What units are in this fuse ? Intensity - Amp

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S01 T01 -D17/D26 © SOCOTEC 2012 - D82101 - E12 - Diaporama Units What units are in this speaker ? 8 Ω resistance - Ohms

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