ELECTRIC UNITS Séquence S01 T01: Distinguer les grandeurs électriques telle que courant, tension, puissance, alternatif, continu, fréquence. © SOCOTEC.

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Presentation transcript:

ELECTRIC UNITS Séquence S01 T01: Distinguer les grandeurs électriques telle que courant, tension, puissance, alternatif, continu, fréquence. © SOCOTEC 2012 - D82101 - E12 - Diaporama

The electric principles What are the different electric source you kwnow ? © SOCOTEC 2012 - D82101 - E12 - Diaporama

The electric principles There is two sources : Direct current Alternative current Dynamo Alternateur + - ACCU FLASH 12 V Noter les exemples donnés par les stagiaires © SOCOTEC 2012 - D82101 - E12 - Diaporama

Direct current sources are polarized with positive and negative poles Direct 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 2012 - D82101 - E12 - Diaporama

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

Direct current representation The direction of electrons is always the same © SOCOTEC 2012 - D82101 - E12 - Diaporama

Alternative current sources We 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 2012 - D82101 - E12 - Diaporama

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

Alternative current representation The 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 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) © 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 ) © 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 ) © 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? © SOCOTEC 2012 - D82101 - E12 - Diaporama

The units © SOCOTEC 2012 - D82101 - E12 - Diaporama

What units are in this light bulb ? Volt watt Appel à l’information © SOCOTEC 2012 - D82101 - E12 - Diaporama

What units are in this fuse ? Intensity - Amp Appel à l’information © SOCOTEC 2012 - D82101 - E12 - Diaporama

Units What units are in this speaker ? resistance - Ohms 8 Ω Appel à l’information © SOCOTEC 2012 - D82101 - E12 - Diaporama