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ELECTRIC UNITS Séquence S01 T01: Distinguer les grandeurs électriques telle que courant, tension, puissance, alternatif, continu, fréquence. © SOCOTEC D E12 - Diaporama
The electric principlesWhat are the different electric source you kwnow ? © SOCOTEC D E12 - Diaporama
The electric principlesThere is two sources : Direct current Alternative current Dynamo Alternateur + - ACCU FLASH 12 V Noter les exemples donnés par les stagiaires © SOCOTEC D E12 - Diaporama
Direct current sources are polarized with positive and negative polesDirect current could be produced by an electrochemical generator like a battery or by a swinging device like a dtnamo or by cells. Dynamo + - ACCU FLASH 12 V Direct current sources are polarized with positive and negative poles © SOCOTEC D E12 - Diaporama
Uses of direct current The direct current is used to supply electric devices like portable electric drills or electric vehicles… © SOCOTEC D E12 - Diaporama
Direct current representationThe direction of electrons is always the same © SOCOTEC D E12 - Diaporama
Alternative current sourcesWe can also use mechanical energy produced by thermical engine, that what we calle a generator. Mais, on peut utiliser la force du vent ( les éoliennes ) En général, on utilise la force de l’eau ( centrale hydraulique ) ou de la vapeur ( centrale thermique ou nucléaire ) pour faire tourner une turbine Un Alternateur produit l’électricité il transforme une énergie mécanique en énergie électrique © SOCOTEC D E12 - Diaporama
Alternative current sourcesThe alternative current is generally used for houses and company electrical installations. © SOCOTEC D E12 - Diaporama
Alternative current representationThe frequency of alternative current match with the number of period per seconds. The frequency is express in Hertz. Le Courant Alternatif change de sens périodiquement Une Période se divise en deux Alternances © SOCOTEC D E12 - Diaporama
Parallel of water : the VoltageThe Voltage is an electric potential difference Is similar to a level difference The Voltage (U) is express in VOLT (V) © SOCOTEC D 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 ) © SOCOTEC D E12 - Diaporama
Parallel of water : electric resistanceThe electric resistance is similar to pipes sections The electric resistance ( R ) is express in OHM ( Ω ) © SOCOTEC D 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? © SOCOTEC D E12 - Diaporama
The units © SOCOTEC D E12 - Diaporama
What units are in this light bulb ?Volt watt Appel à l’information © SOCOTEC D E12 - Diaporama
What units are in this fuse ?Intensity - Amp Appel à l’information © SOCOTEC D E12 - Diaporama
Units What units are in this speaker ? resistance - Ohms 8 ΩAppel à l’information © SOCOTEC D E12 - Diaporama
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