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Photoresistor 9.0 V 1.0 kN FIGURE P23.34 fww

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter30: Atomic Physics

Section: Chapter Questions

Problem 27CQ: List all the possible values of s and msfor an electron. Are there particles for which these values...

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

A photoresistor, whose resistance decreases with light intensity, is connected in the circuit as shown. On a sunny day, the photoresistor has a resistance of 0.56 kΩ. On a cloudy day, the resistance rises to 4.0 kΩ. At night, the resistance is 20 kΩ.
a. What does the voltmeter read for each of these conditions?
b. Does the voltmeter reading increase or decrease as the light intensity increases?

Photoresistor
9.0 V
1.0 kN
FIGURE P23.34
fww

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