Current, Resistance, and CircuitsPLS ANSWER NO.3 1. Three resistors are connected in series to a 24-V battery, and an ammeter inthe circuit reads 0.50 A. The first resistor is rated at 22 ohms, and the second at8 ohms. Find the(a) total resistance;(b) resistance of the third resistor; and(c) potential difference across the third resistor.2. We would like to make a 600-ohm resistor out of Nichrome wire with a cross-sectional area of 3.0 x 103 square centimeter. If the resistivity of Nichrome is110 x 106 ohm-centimeters, how long should the wire be?3. In a circuit, a variable resistor is to be connected across a potential differenceof 60 V to allow the current to be adjusted in the range from 40 mA to 100 mA.Over what range must the resistance vary?4. Three 60.0-W, 120-V lightbulbs are connected across a 120-V power source.Find (a) the total power delivered to the three bulbs and (b) the potentialdifference across each.R1120 VR2R3Assume the resistance of each bulb is constant.5. In the figure below, with an emf equal toHow much energy is dissipated by all four resistors in 1 min?2.0 V, R, = 6.0N and R2 = 18.0 N.R1R2R2R2

Answered: Image /qna-images/answer/2b914332-0851-47f2-bbd1-705bcfaca230.jpg

3. In a circuit, a variable resistor is to be connected across a potential difference of 60 V to allow the current to be adjusted in the range from 40 mA to 100 mA. Over what range must the resistance vary?

3. In a circuit, a variable resistor is to be connected across a potential difference of 60 V to allow the current to be adjusted in the range from 40 mA to 100 mA. Over what range must the resistance vary?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 14CQ: The power dissipated in a resistor is given by P = V2/R, which means power decreases if resistance...

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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

Current, Resistance, and Circuits PLS ANSWER NO.3

1. Three resistors are connected in series to a 24-V battery, and an ammeter in
the circuit reads 0.50 A. The first resistor is rated at 22 ohms, and the second at
8 ohms. Find the
(a) total resistance;
(b) resistance of the third resistor; and
(c) potential difference across the third resistor.
2. We would like to make a 600-ohm resistor out of Nichrome wire with a cross-
sectional area of 3.0 x 103 square centimeter. If the resistivity of Nichrome is
110 x 106 ohm-centimeters, how long should the wire be?
3. In a circuit, a variable resistor is to be connected across a potential difference
of 60 V to allow the current to be adjusted in the range from 40 mA to 100 mA.
Over what range must the resistance vary?
4. Three 60.0-W, 120-V lightbulbs are connected across a 120-V power source.
Find (a) the total power delivered to the three bulbs and (b) the potential
difference across each.
R1
120 V
R2
R3
Assume the resistance of each bulb is constant.
5. In the figure below, with an emf equal to
How much energy is dissipated by all four resistors in 1 min?
2.0 V, R, = 6.0N and R2 = 18.0 N.
R1
R2
R2
R2

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