40. (II) An ordinary flashlight uses two D-cell 1.5-V batteries connected in series to provide 3.0 V across the bulb, as in Fig. 18–4b (Fig. 18–36). The bulb draws 380 mA when turned on. (a) Calculate the resistance of the bulb and the power dis- sipated. (b) By what factor would the power increase if four D-cells in series (total 6.0 V) were used with the same bulb? (Neglect heating effects of the filament.) Why shouldn't you try this? FIGURE 18–36 Problem 40 (Х-гаy of a flashlight).

40. (II) An ordinary flashlight uses two D-cell 1.5-V batteries connected in series to provide 3.0 V across the bulb, as in Fig. 18–4b (Fig. 18–36). The bulb draws 380 mA when turned on. (a) Calculate the resistance of the bulb and the power dis- sipated. (b) By what factor would the power increase if four D-cells in series (total 6.0 V) were used with the same bulb? (Neglect heating effects of the filament.) Why shouldn't you try this? FIGURE 18–36 Problem 40 (Х-гаy of a flashlight).

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

40. (II) An ordinary flashlight uses two D-cell 1.5-V batteries
connected in series to provide 3.0 V across the bulb, as in
Fig. 18–4b (Fig. 18–36). The bulb draws 380 mA when turned
on. (a) Calculate the resistance of the bulb and the power dis-
sipated. (b) By what factor would the power increase if four
D-cells in series (total 6.0 V) were used with the same bulb?
(Neglect heating effects of the filament.) Why shouldn't you
try this?
FIGURE 18–36
Problem 40
(Х-гаy of a
flashlight).

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