The resistances of most substances increase when they are heated. A bulb for a flashlight using 3.0 V has a resistance of 2.0 ohms when cold and 24 ohms when hot. Calculate the current (Amps) through the bulb when (a) cold and (b) hot. Claculate the power consumed when (c) cold and (d) hot.

The resistances of most substances increase when they are heated. A bulb for a flashlight using 3.0 V has a resistance of 2.0 ohms when cold and 24 ohms when hot. Calculate the current (Amps) through the bulb when (a) cold and (b) hot. Claculate the power consumed when (c) cold and (d) hot.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter18: Direct-Current Circuits

Section: Chapter Questions

Problem 41P

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

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3.
The resistances of most substances increase when they are
heated. A bulb for a flashlight using 3.0 V has a resistance of 2.0
ohms when cold and 24 ohms when hot. Calculate the current
(Amps) through the bulb when (a) cold and (b) hot. Claculate the
power consumed when (c) cold and (d) hot.
Cold
Hot

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