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Physics / Physics with MasteringPhysics 4 / Chapter 21 / Problem 83GP

Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker

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CE Predict/Explain The resistivity of tungsten increases

Chapter 21, Problem 83GP

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QUESTION:

CE? ?Predict/Explain? The resistivity of tungsten increases with temperature, (a) When a light containing a tungsten filament heats up, does its power consumption increase, decrease, or stay the same? (b)? Choose the best explanation from among the following: I?. The voltage is unchanged, and therefore an increase in resistance implies a reduced power, as we can see from P = V2/R. II. Increasing the resistance increases the power, as is clear from P = I2R. III. The power consumption is independent of resistance, as we can see from P = IV.

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QUESTION:

CE? ?Predict/Explain? The resistivity of tungsten increases with temperature, (a) When a light containing a tungsten filament heats up, does its power consumption increase, decrease, or stay the same? (b)? Choose the best explanation from among the following: I?. The voltage is unchanged, and therefore an increase in resistance implies a reduced power, as we can see from P = V2/R. II. Increasing the resistance increases the power, as is clear from P = I2R. III. The power consumption is independent of resistance, as we can see from P = IV.

ANSWER:

Step 1 of 2

The final charge is given by,

We can write the charge as function of time as,

Therefore,

Implies,

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