Question 1

An electronic component with a 17-Ω resistor is rated for use at power levels not exceeding $14 \mathrm {~W}$ What is the safe current through the component?

Accepted Answer

A) 0.91 A 
B) 1.21 A 
C) 238 A 
D) 0.22 A 
A) 0.91 A 
B) 1.21 A 
C) 238 A 
D) 0.22 A

Question 2

A 4000-Ω resistor is connected across a 220-V power source.What is the current through the resistor?

Accepted Answer

A) 0.055 A 
B) 1.8 A 
C) 5.5 A 
D) 18 A 
A) 0.055 A 
B) 1.8 A 
C) 5.5 A 
D) 18 A

Question 3

If the power rating of a 400-Ω resistor is 0.800 W,what is the maximum voltage that can safely be connected across the resistor?

Accepted Answer

A) 110 V 
B) 17.9 V 
C) 170 V 
D) 1.80 V 
A) 110 V 
B) 17.9 V 
C) 170 V 
D) 1.80 V

Question 4

The resistivity of gold is $2.44 \times 10^{ - 8} \Omega \cdot \mathrm { m }$ at a temperature of 20°C.A gold wire,1.8 mm in diameter and 14 cm long,carries a current of 480 mA.What power is dissipated in this wire at 20°C?

Accepted Answer

A) 0.31 mW 
B) 0.077 mW 
C) 0.14 mW 
D) 0.19 mW 
E) 0.25 mW 
A) 0.31 mW 
B) 0.077 mW 
C) 0.14 mW 
D) 0.19 mW 
E) 0.25 mW

Question 5

A heating element having a resistance (at its operating temperature)of 148 Ω is connected to a battery having an emf of 523 V and unknown internal resistance.It is found that thermal energy is being generated in the resistance of the heating element at a rate of 66.0 W.What is the rate at which thermal energy is being generated in the internal resistance of the battery?

Accepted Answer

The answer of A heating element having a resistance (at...

Question 6

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

Accepted Answer

A) 0.0030 V 
B) 0.32 V 
C) 0.64 V 
D) 1.6 V 
A) 0.0030 V 
B) 0.32 V 
C) 0.64 V 
D) 1.6 V

Question 7

The length of a certain wire is kept same while its radius is doubled.What is the new resistance of this wire?

Accepted Answer

A) It is increased by a factor of 2. 
B) It is increased by a factor of 4. 
C) It is reduced by a factor of 2. 
D) It is reduced by a factor of 4. 
E) It is reduced by a factor of 8. 
A) It is increased by a factor of 2. 
B) It is increased by a factor of 4. 
C) It is reduced by a factor of 2. 
D) It is reduced by a factor of 4. 
E) It is reduced by a factor of 8.

Question 8

For the circuit shown in the figure,write the Kirchhoff loop equation for the entire outside loop.Notice the directions of the currents!

Accepted Answer

V₁ + I₃R₃ - V

Question 9

What different resistances can be obtained by using two 2.0-Ω resistors and one 4.0-Ω resistor? You must use all three of them in each possible combination.

Accepted Answer

0.80 Ω,1.5

Question 10

A light bulb operating at a dc voltage of 120 V has a power rating of 60 W.What is the current through this bulb?

Accepted Answer

A) 1.5 A 
B) 2.5 A 
C) 0.50 A 
D) 2.0 A 
E) 1.0 A 
A) 1.5 A 
B) 2.5 A 
C) 0.50 A 
D) 2.0 A 
E) 1.0 A

Question 11

For the circuit shown in the figure,R1 = 50 Ω,R2 = 20 Ω,R3 = 35 Ω,R4 = 10 Ω,R5 = 68 Ω,I1 = 0.111 A,I2 = 0.142 A,and the batteries are ideal.
(a)Determine V1 and V2.
(b)What is the potential difference across R4?

Accepted Answer

(a)V₁ = 12

Question 12

A combination of a 2.0-Ω resistor in series with 4.0-Ω resistor is connected in parallel with a 3.0-Ω resistor.What is the equivalent resistance of this system?

Accepted Answer

A) 2.0 Ω 
B) 3.0 Ω 
C) 4.0 Ω 
D) 9.0 Ω 
A) 2.0 Ω 
B) 3.0 Ω 
C) 4.0 Ω 
D) 9.0 Ω

Question 13

A resistor operated at 120 V dc is rated at 1.40 kW.
(a)What is the normal operating current through the resistor?
(b)What is the resistance of the resistor?

Accepted Answer

(a)11.7 A

Question 14

A 9-V battery is hooked up to two resistors in series.One has a resistance of 5 Ω,and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.Which resistor is converting electric energy into internal energy at the higher rate?

Accepted Answer

A) the 10-Ω resistor 
B) the 5-Ω resistor 
C) Energy is being dissipated by both resistors at the same rate. 
A) the 10-Ω resistor 
B) the 5-Ω resistor 
C) Energy is being dissipated by both resistors at the same rate.

Question 15

A 5.0-V battery storing 43.0 kJ of energy supplies $1.5 \mathrm {~A}$ of current to a circuit.How much energy does the battery have left after powering the circuit for $1.0 \text { h.? }$

Accepted Answer

A) 16 kJ 
B) 27 kJ 
C) 43 kJ 
D) 41 kJ 
A) 16 kJ 
B) 27 kJ 
C) 43 kJ 
D) 41 kJ

Question 16

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the emf ε if the batteries are ideal.(It is not necessary to solve the entire circuit.)

Accepted Answer

A) +3 V 
B) +19 V 
C) -3 V 
D) -10 V 
E) -19 V 
A) +3 V 
B) +19 V 
C) -3 V 
D) -10 V 
E) -19 V

Question 17

A 6.0-Ω and a 12-Ω resistor are connected in parallel across an ideal 36-V battery.What power is dissipated by the 6.0-Ω resistor?

Accepted Answer

A) 220 W 
B) 48 W 
C) 490 W 
D) 24 W 
A) 220 W 
B) 48 W 
C) 490 W 
D) 24 W

Question 18

For the circuit shown in the figure,the battery is ideal and all quantities are accurate to two significant figures.Find the current through (a)the 1.0-Ω resistor,(b)the 3.0-Ω resistor,and (c)the 4.0-Ω resistor?

Accepted Answer

(a)2.8 A

Question 19

A 100-W resistance heater is connected to a 110-V dc source.What is the current through the heater?

Accepted Answer

A) 1.1 A 
B) 2.2 A 
C) 3.3 A 
D) 4.4 A 
E) 0.91 A 
A) 1.1 A 
B) 2.2 A 
C) 3.3 A 
D) 4.4 A 
E) 0.91 A

Question 20

Five 2.0-Ω resistors are connected as shown in the figure.What is the equivalent resistance of this combination between points a and b?

Accepted Answer

A) 1.0 Ω 
B) 10.0 Ω 
C) 2.0 Ω 
D) 6.0 Ω 
E) 0.40 Ω 
A) 1.0 Ω 
B) 10.0 Ω 
C) 2.0 Ω 
D) 6.0 Ω 
E) 0.40 Ω

Exam 17: Dc Circuits

An electronic component with a 17-Ω resistor is rated for use at power levels not exceeding 14 W14 \mathrm {~W}14 W What is the safe current through the component?

A 4000-Ω resistor is connected across a 220-V power source.What is the current through the resistor?

If the power rating of a 400-Ω resistor is 0.800 W,what is the maximum voltage that can safely be connected across the resistor?

The resistivity of gold is 2.44×10−8Ω⋅m2.44 \times 10^{ - 8} \Omega \cdot \mathrm { m }2.44×10−8Ω⋅m at a temperature of 20°C.A gold wire,1.8 mm in diameter and 14 cm long,carries a current of 480 mA.What power is dissipated in this wire at 20°C?

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

The length of a certain wire is kept same while its radius is doubled.What is the new resistance of this wire?

For the circuit shown in the figure,write the Kirchhoff loop equation for the entire outside loop.Notice the directions of the currents!

What different resistances can be obtained by using two 2.0-Ω resistors and one 4.0-Ω resistor? You must use all three of them in each possible combination.

A light bulb operating at a dc voltage of 120 V has a power rating of 60 W.What is the current through this bulb?

For the circuit shown in the figure,R1 = 50 Ω,R2 = 20 Ω,R3 = 35 Ω,R4 = 10 Ω,R5 = 68 Ω,I1 = 0.111 A,I2 = 0.142 A,and the batteries are ideal. (a)Determine V1 and V2. (b)What is the potential difference across R4?

A combination of a 2.0-Ω resistor in series with 4.0-Ω resistor is connected in parallel with a 3.0-Ω resistor.What is the equivalent resistance of this system?

A resistor operated at 120 V dc is rated at 1.40 kW. (a)What is the normal operating current through the resistor? (b)What is the resistance of the resistor?

A 9-V battery is hooked up to two resistors in series.One has a resistance of 5 Ω,and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.Which resistor is converting electric energy into internal energy at the higher rate?

A 5.0-V battery storing 43.0 kJ of energy supplies 1.5 A1.5 \mathrm {~A}1.5 A of current to a circuit.How much energy does the battery have left after powering the circuit for 1.0 h.? 1.0 \text { h.? }1.0 h.?

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the emf ε if the batteries are ideal.(It is not necessary to solve the entire circuit.)

A 6.0-Ω and a 12-Ω resistor are connected in parallel across an ideal 36-V battery.What power is dissipated by the 6.0-Ω resistor?

For the circuit shown in the figure,the battery is ideal and all quantities are accurate to two significant figures.Find the current through (a)the 1.0-Ω resistor,(b)the 3.0-Ω resistor,and (c)the 4.0-Ω resistor?

A 100-W resistance heater is connected to a 110-V dc source.What is the current through the heater?

Five 2.0-Ω resistors are connected as shown in the figure.What is the equivalent resistance of this combination between points a and b?

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Magnetism

Electromagnetic Induction

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Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

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Filters

An electronic component with a 17-Ω resistor is rated for use at power levels not exceeding $14 \mathrm {~W}$ What is the safe current through the component?

The resistivity of gold is $2.44 \times 10^{ - 8} \Omega \cdot \mathrm { m }$ at a temperature of 20°C.A gold wire,1.8 mm in diameter and 14 cm long,carries a current of 480 mA.What power is dissipated in this wire at 20°C?

A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10^-6 Ω ∙ m.When this wire carries a current of 0.50 A,what is the voltage across its ends?

For the circuit shown in the figure,R₁ = 50 Ω,R₂ = 20 Ω,R₃ = 35 Ω,R₄ = 10 Ω,R₅ = 68 Ω,I₁= 0.111 A,I₂ = 0.142 A,and the batteries are ideal. (a)Determine V₁ and V₂. (b)What is the potential difference across R₄?

A 5.0-V battery storing 43.0 kJ of energy supplies $1.5 \mathrm {~A}$ of current to a circuit.How much energy does the battery have left after powering the circuit for $1.0 \text { h.? }$