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An ordinary flashlight uses two D cells 1.50 V batteries connected in series. The bulb draws 380 m when turned on.
a. Calculate the resistance of the bulb and the power dissipated.
b. By what factor would the power increase if four D cells in series were used with the same bulb? (Neglect heating effects of the filament.) Why shouldn’t you try this?
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Physics, 22.06.2019 19:50, fili20
The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.
Answers: 3
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An ordinary flashlight uses two D cells 1.50 V batteries connected in series. The bulb draws 380 m w...
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