College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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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 di…
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1. A flashlight bulb carries a current of 0.38 A for 98 s. How much charge flows through the bulb in this time? How many electrons? Chap 21_#1 2. When a potential difference of 12 V is applied to a given wire, it conducts 0.45 A of current. What is the resistance of the wire? Cha 21_#10 3. When a potential difference of 12 V is applied to a wire 6.9 m long and 0.33 mm in diameter, the result is an electric current of 2.1 A. What is the resistivity of the wire? Chap 21_#18 4. A 65-W lightbulb operates on a potential difference of 95 V. Find (a) the current in the bulb and (b) the resistance of the bulb. (c) If this bulb is replaced with one whose resistance is half the value found in part (b), is its power rating greater than or less than 65 W? By what factor? Chap 21 #30 5. A 99-0 resistor has a current of 0.82 A and is connected in series with a 110@0 resistor. What is the emf of the battery to which the resistors are connected? Chap 21 #44 6. Find the equivalent resistance between points A and B shown in figure below. Chap 21_#46 ww 4.8 N A ww 3.3 0 1.5 N 2.5 0 8.1 N 6.3 0 ww ww ww
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Transcribed Image Text:1. A flashlight bulb carries a current of 0.38 A for 98 s. How much charge flows through the bulb in this time? How many electrons? Chap 21_#1 2. When a potential difference of 12 V is applied to a given wire, it conducts 0.45 A of current. What is the resistance of the wire? Cha 21_#10 3. When a potential difference of 12 V is applied to a wire 6.9 m long and 0.33 mm in diameter, the result is an electric current of 2.1 A. What is the resistivity of the wire? Chap 21_#18 4. A 65-W lightbulb operates on a potential difference of 95 V. Find (a) the current in the bulb and (b) the resistance of the bulb. (c) If this bulb is replaced with one whose resistance is half the value found in part (b), is its power rating greater than or less than 65 W? By what factor? Chap 21 #30 5. A 99-0 resistor has a current of 0.82 A and is connected in series with a 110@0 resistor. What is the emf of the battery to which the resistors are connected? Chap 21 #44 6. Find the equivalent resistance between points A and B shown in figure below. Chap 21_#46 ww 4.8 N A ww 3.3 0 1.5 N 2.5 0 8.1 N 6.3 0 ww ww ww
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