A half wave diode rectifier with 4,700 uF smoothing capacitor connects a 50 2 resistive load to a 60 Hz, 115 V rms ac supply. Q3 Sketch the ac supply voltage, resistive load voltage and capacitor current over a complete ac supply period assuming a diode conduction angle of 20° (a) (b) Indicate on this sketch the period when the diode is conducting. Assuming an ideal diode determine the % voltage ripple across the resistive load. (c) (d) Calculate the average power dissipated by the resistive load. (e) Estimate the peak capacitor charging current. (f) Estimate and sketch the AC supply current over a complete 60 Hz period. Estimate the diode conduction loss (W) assuming a forward diode voltage drop of 1.5 V. (g)

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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.