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Cum calculez caderea de tensiune pe un rezistor?

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Am un transformator toroidal care scoate in secundar 280V, iar dupa redresare ajunge la ~400V. Eu am nevoie de o tensiune de 300V c.c. pentru a alimenta un amplificator cu lampi. Pentru a reduce tensiunea m-am gandit la un rezistor de putere. Cum il calculez, tinand cont de curentul cerut de amplificator care este de 170-180 mA???

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mai omule, tu te-ai apucat sa dezgropi topicuri? te rog fii atent la data postarii, asta nu are chiar 3 ani ca celalalt pe care l-ai scos de la 2m, dar e si asta vechi, daca nu se dumirea omul, mai zicea ceva, mai punea o intrebare, asa daca nu s-a mai postat de cateva luni, crezi ca mai e nevoie?

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