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slashlinux

Puterea intr-un circuit

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Salut, Se da urmatorul circuit : E = 12 VI = 75 A Sa se determine puterea maxima in watt a circuitului. Formula puterii :P = E * I P = 12* 75P= 900 WattAsta este exemplu de circuit la o baterie de masina.Sa inteleg ca daca pun 9 becuri de 100 watt le aprinde si daca mai pun inca unu de 100 de watt nu se aprinde?? Corectati-ma va rog daca nu am dreptate.. Cum pot afla cati ohm are un bec de 100 watt??Multumesc

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Poţi să pui şi o mie de becuri, tensiunea debitată de sursă (bateria) va scădea pînă se realizează un echilibru.Filamentul are rez diferite la rece şi la cald, semănător unui termistor. De aia se folosesc uneori la menţinerea unui curent constant în unele circuite.

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Ti-a raspuns colegul zal la intrebare, dar cred ca tu faci o confuzie. Bateria de acumulatori auto nu are 75A ci 75Ah (amperi-ora), adica poate alimenta un consumator care consuma 1A timp de 75 ore, sau altul care consuma 25A timp de 3 ore.Referitor la becuri, colegul zal are dreptate. Daca totusi vrei sa afli valoarea rezistentei la rece, o masori, iar la cald se poate calcula (P/U=I si R=U/I ).

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