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PUTEREA ELECTRICA

PUTEREA ELECTRICA. EXERCI Ţ II E X PLICATIVE. Închide. ENUNŢUL PROBLEMEI. 6.3. O baterie are t.e.m = 32 V, iar bornele ei se unesc printr-un fir lung de 3 m. Î n fir se produce o cadere de poten ţ ial de 30 V ş i se consum ă o putere de 6 W. Se cere : rezisten ţ a interioar ă a bateriei

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PUTEREA ELECTRICA

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  1. PUTEREA ELECTRICA EXERCIŢII EXPLICATIVE Închide

  2. ENUNŢUL PROBLEMEI 6.3. O baterie are t.e.m = 32 V, iar bornele ei se unesc printr-un fir lung de 3 m. În fir se produce o cadere de potenţial de 30 V şi se consumă o putere de 6 W. Se cere : • rezistenţa interioară a bateriei • rezistenţa firului • timpul necesar pentru a trece prin circuit 720 C.

  3. Datele problemei şi configurare grafică E = 32 V l = 3 m U = 30 V P = 6 W a) r=? b)R=? c)t=? q=720 C R l - + E, r I

  4. P U Rezolvarea problemei • a,b) U = I·R (1) P = U·I → I = (2) Introducem (2) în (1) R l - + I E, r

  5. Rezolvarea problemei

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