October 2018 1 20 Report

1. Grzejnik elektryczny ma moc 1000W przy napięciu pracy równym 200V. Jaka będzie moc grzejnika jeżeli jego opór zmiejszymy o połow?

2. Silnik elektryczny do swojej pracy potrzebuje prądu o wielkości 10A. Uzwojenia silnika mają opór 10Ω. Jaka jest moc silnika i jaką pracę wkona prąd elektryczny, jeżeli silnik będzie pracował 10s.

3. Wykonano opornik z miedzi o oporze właściwym 1,5 Ω/m(do kwadratu) o długości 1 metra i średnicy 2 mm. Jak zmieni się opór tego przewodnika jeżeli przetniemy go na połowę i obydwie połówki połączymy razem.

4. Do źródła napięcia o wartości 10 V podłączono opornik o oporze 5. Jaki prąd przepłynie przez opornik. Oblicz długość tego przewodnika jeżeli jego przekrój wynosi 10mm(do kwadratu) a opór właściwy 1,5 Ω/m(do kwadratu).

BARDZO PROSZE O POMOC !! POZDRAWAIM.


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