elemente de circuit electrice
DESCRIPTION
ELEMENTE DE CIRCUIT ELECTRICE. http://williamson-labs.com/water-model.htm. Tensiune (U) – Volti Curent (I) – Amperi Rezistenta (R) – Ohmi. Putere (Watti) = Volti x Amperi. Circuit electric sursa+consumator+conductoare de legatura. - PowerPoint PPT PresentationTRANSCRIPT
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ELEMENTE DE CIRCUIT ELECTRICE
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http://williamson-labs.com/water-model.htmTensiune (U) – Volti Curent (I) – Amperi
Rezistenta (R) – Ohmi
I
UR
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Putere (Watti) = Volti x Amperi
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Circuit electric sursa+consumator+conductoare de
legatura
Conectand conductori intre + si – bateriei curentul va circula
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TENSIUNEA
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Tensiunea este ca diferenta de presiune, intotdeauna se masoara intre 2 puncte
Masurarea tensiunii se face intre 2 puncte
Cand masurati c.c. borna rosu a aparatului de masura este conectata la +
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PAMANTUL
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ANALOGIE CIRCUITE
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CURENT ELECTRIC (AMPERI)
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REZISTENTA are valoare, toleranta, putere
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Rezistoare chimice peliculare
– depunerea pe un suport izolant a unui semiconductor din carbon sau metal (obisnuite cu toleranta 5-10%, precizie 1%)
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Rezistoare cu pelicula metalica
• Dimensiunea e cu atat mai mica cu cat Puterea e mai mica.
• P=0,125; 0,5; 1; 2W
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REZISTOARE BOBINATE• Un conductor infasurat pe un suport izolant
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Si altele......potentiometre – au 2 borne fixe si un cursor
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Codul culorilor la rezistente
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Condensatorul (valoare, tensiune maxima, destinatia)
• Capacitatea = Farad
• Pico Farad 1pF = 10-12F
• Micro Farad 1μF = 10-6F
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Condensatoare electrolitice
• Reactia chimica intre un electrolit si un metal (Al, tantal) ce formeaza dielectricul
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Condensatoare cu stiroflex
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Condensator ceramic
• Condensator cu hartie
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Incarcarea condensatorului
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Descarcarea condensatoarelor
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Bobina - Inductanta
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Dioda
• este un element neliniar de circuit (curentul prin diodă nu este direct proporţional cu tensiunea la terminalele acesteia), alcătuit din materiale cu proprietăţi semiconductoare: seleniu, germaniu şi siliciu. Dioda este formată din doi electrozi: anod şi catod şi permite trecerea curentului electric într-un singur sens.
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Regim de polarizare directă
• - dioda prezintă o rezistenţă mică, şi permite trecerea curentului prin ea.- se comportă ca un contact închis- regimul se numeşte de conducţie
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Regim de polarizare inversă (i)
• - dioda prezintă o rezistenţă mare, şi nu permite trecerea curentului prin ea- se comportă ca un contact deschis