   Chapter 17, Problem 2CQ

Chapter
Section
Textbook Problem

A 12-V battery is connected across a device with variable resistance. As the resistance of the device increases, determine whether the following quantities increase, decrease, or remain unchanged. Indicate your answers with I, D, or U, respectively. (a) The current through the device. (b) The voltage across the device. (c) The power consumed by the device.

(a)

To determine
Whether the current through the device increases, decreases or remains the same if the voltage across the device is 12V and the resistance is increased.

Explanation

The relation connecting the current I , voltage V and resistance R is given by ohms law V=I

(b)

To determine
Whether the voltage across the device increases decreases or remains the same if the applied voltage is 12V and the resistance is varied.

(c)

To determine
Whether the power consumed by the device increases, decreases or remains the same if the voltage across the device is 12V and the resistance is increased.

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