First, a real battery is connected to a load R1 = 0.5 Q, then the same battery is connected to another load R2 = 1.1 Q. What is the internal resistance of the battery if in both cases the power released in the loads is the same. %3! The internal resistance, r = Units Select an answer What is the emf of the battery if the useful power in both cases was 18 W? The emf of the battery, E = Units Select an answer

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Photoconductive Cell

Photoconductive cells are light-sensitive resistors in which resistance is inversely proportionated to light intensity when illuminated. These devices consist of a thin single-crystal or polycrystalline film of composite semiconductor materials. Cadmium sulfide (CdS) is used to make the most commercially available photoconductive particles which are sensitive to light in the visible spectrum. Other less commonly used substances respond to infrared light, but not to the visible spectrum. Such substances are lead sulfide (PbS), lead selenide (PbSe), and lead telluride (PbTe), and so on.