Question 1

A battery of emf 24 V is connected to a 6- $\Omega$ resistor.As a result, current of 3 A exists in the resistor.The terminal potential difference of the battery is:

Accepted Answer

A) 0 V 
B) 6 V 
C) 12 V 
D) 18 V 
E) 24 V 
A) 0 V 
B) 6 V 
C) 12 V 
D) 18 V 
E) 24 V D

Question 2

Resistor 1 has twice the resistance of resistor 2.The two are connected in parallel and a potential difference is maintained across the combination.The rate of thermal energy dissipation in 1 is:

Accepted Answer

A) the same as that in 2 
B) twice that in 2 
C) half that in 2 
D) four times that in 2 
E) one fourth that in 2 
A) the same as that in 2 
B) twice that in 2 
C) half that in 2 
D) four times that in 2 
E) one fourth that in 2 C

Question 3

Four 20-$\Omega$ resistors are connected in series and the combination is connected to a 20-V emf device.The current in any one of the resistors is:

Accepted Answer

A) 0.25 A 
B) 1.0 A 
C) 4.0 A 
D) 5.0 A 
E) 100 A 
A) 0.25 A 
B) 1.0 A 
C) 4.0 A 
D) 5.0 A 
E) 100 A A

Question 4

The circuit shown was wired for the purpose of measuring the resistance of the lamp L.Inspection shows that:

Accepted Answer

A) voltmeter V and rheostat R should be interchanged 
B) the circuit is satisfactory 
C) the ammeter A should be in parallel with R, not L 
D) the meters, V and A, should be interchanged 
E) L and V should be interchanged 
A) voltmeter V and rheostat R should be interchanged 
B) the circuit is satisfactory 
C) the ammeter A should be in parallel with R, not L 
D) the meters, V and A, should be interchanged 
E) L and V should be interchanged

Question 5

In the diagrams, all light bulbs are identical and all emf devices are identical.In which circuit (I, II, III, IV, V)will the bulbs glow with the same brightness as in circuit X?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 6

In the figure, voltmeter V1 reads 600 V, voltmeter V2 reads 580 V, and ammeter A reads 100 A.The power wasted in the transmission line connecting the power house to the consumer is:

Accepted Answer

A) 1 kW 
B) 2 kW 
C) 58 kW 
D) 59 kW 
E) 60 kW 
A) 1 kW 
B) 2 kW 
C) 58 kW 
D) 59 kW 
E) 60 kW

Question 7

Two identical batteries, each with an emf of 18 V and an internal resistance of 1 $\Omega$, are wired in parallel by connecting their positive terminals together and connecting their negative terminals together.The combination is then wired across a 4-$\Omega$ resistor.The current in each battery is:

Accepted Answer

A) 1.0 A 
B) 2.0 A 
C) 3.6 A 
D) 4.0 A 
E) 4.5 A 
A) 1.0 A 
B) 2.0 A 
C) 3.6 A 
D) 4.0 A 
E) 4.5 A

Question 8

A 120-V power line is protected by a 15-A fuse.What is the maximum number of 120 V, 500 W light bulbs that can be operated at full brightness from this line?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 9

The resistance of resistor 1 is twice the resistance of resistor 2.The two are connected in series and a potential difference is maintained across the combination.Then:

Accepted Answer

A) the current in 1 is twice that in 2 
B) the current in 1 is half that in 2 
C) the potential difference across 1 is twice that across 2 
D) the potential difference across 1 is half that across 2 
E) none of the above are true 
A) the current in 1 is twice that in 2 
B) the current in 1 is half that in 2 
C) the potential difference across 1 is twice that across 2 
D) the potential difference across 1 is half that across 2 
E) none of the above are true

Question 10

Here is a loop equation:   .What does this equation represent?

Accepted Answer

A) a charging capacitor 
B) a discharging capacitor 
C) a capacitor that has been disconnected 
D) a charging resistor 
E) an oscillating circuit 
A) a charging capacitor 
B) a discharging capacitor 
C) a capacitor that has been disconnected 
D) a charging resistor 
E) an oscillating circuit

Question 11

Resistances of 2.0 $\Omega$, 4.0$\Omega$, and 6.0 $\Omega$and a 24-V battery are all in series.The current in the 2.0 $\Omega$ resistor is:

Accepted Answer

A) 12 A 
B) 4.0 A 
C) 2.4 A 
D) 2.0 A 
E) 0.50 A 
A) 12 A 
B) 4.0 A 
C) 2.4 A 
D) 2.0 A 
E) 0.50 A

Question 12

A 3-$\Omega$ and a 1.5-$\Omega$resistor are wired in parallel and the combination is wired in series to a 4-$\Omega$ resistor and a 10-V emf device.The potential difference across the 3-$\Omega$ resistor is:

Accepted Answer

A) 2.0 V 
B) 6.0 V 
C) 8.0 V 
D) 10 V 
E) 12 V 
A) 2.0 V 
B) 6.0 V 
C) 8.0 V 
D) 10 V 
E) 12 V

Question 13

A battery is connected across a parallel combination of two identical resistors.If the potential difference across the terminals is V and the current in the battery is i, then:

Accepted Answer

A) the potential difference across each resistor is V and the current in each resistor is i 
B) the potential difference across each resistor is V/2 and the current in each resistor is i/2 
C) the potential difference across each resistor is V and the current in each resistor is i/2 
D) the potential difference across each resistor is V/2 and the current in each resistor is i 
E) none of the above are true 
A) the potential difference across each resistor is V and the current in each resistor is i 
B) the potential difference across each resistor is V/2 and the current in each resistor is i/2 
C) the potential difference across each resistor is V and the current in each resistor is i/2 
D) the potential difference across each resistor is V/2 and the current in each resistor is i 
E) none of the above are true

Question 14

A 3-$\Omega$and a 1.5-$\Omega$ resistor are wired in parallel and the combination is wired in series to a 4-$\Omega$ resistor and a 10-V emf device.The current in the 3-$\Omega$ resistor is:

Accepted Answer

A) 0.33 A 
B) 0.67 A 
C) 2.0 A 
D) 3.3 A 
E) 6.7 A 
A) 0.33 A 
B) 0.67 A 
C) 2.0 A 
D) 3.3 A 
E) 6.7 A

Question 15

In the capacitor discharge formula q = q0e-t/RC the symbol t represents:

Accepted Answer

A) the time constant 
B) the time it takes for C to lose the fraction 1/e of its initial charge 
C) the time it takes for C to lose the fraction (1 - 1/e)of its initial charge 
D) the time it takes for C to lose essentially all of its initial charge 
E) none of the above 
A) the time constant 
B) the time it takes for C to lose the fraction 1/e of its initial charge 
C) the time it takes for C to lose the fraction (1 - 1/e)of its initial charge 
D) the time it takes for C to lose essentially all of its initial charge 
E) none of the above

Question 16

A certain capacitor, in series with a 720- $\Omega$  resistor, is being charged.At the end of 10 ms its charge is half the final value.The capacitance is about:

Accepted Answer

A) 9.6 $\mu$F 
B) 14 $\mu$F 
C) 20 $\mu$F 
D) 7.2 F 
E) 10 F 
A) 9.6 $\mu$F 
B) 14 $\mu$F 
C) 20 $\mu$F 
D) 7.2 F 
E) 10 F

Question 17

The terminal potential difference of a battery is less than its emf:

Accepted Answer

A) under all conditions 
B) only when the battery is being charged 
C) only when the battery is being discharged 
D) only when there is no current in the battery 
E) under no conditions 
A) under all conditions 
B) only when the battery is being charged 
C) only when the battery is being discharged 
D) only when there is no current in the battery 
E) under no conditions

Question 18

A series circuit consists of a battery with internal resistance r and an external resistor R.If these two resistances are equal (r = R)then the energy dissipated per unit time by the internal resistance r is:

Accepted Answer

A) the same as by R 
B) half that by R 
C) twice that by R 
D) one third that by R 
E) unknown unless the emf is given 
A) the same as by R 
B) half that by R 
C) twice that by R 
D) one third that by R 
E) unknown unless the emf is given

Question 19

Two wires made of the same material have the same length but different diameter.They are connected in parallel to a battery.The quantity that is NOT the same for the wires is:

Accepted Answer

A) the end-to-end potential difference 
B) the current 
C) the current density 
D) the electric field 
E) the electron drift velocity 
A) the end-to-end potential difference 
B) the current 
C) the current density 
D) the electric field 
E) the electron drift velocity

Question 20

A total resistance of 3.0 $\Omega$ is to be produced by combining an unknown resistor R with a 12 $\Omega$ resistor.What is the value of R and how is it to be connected to the 12 $\Omega$ resistor?

Accepted Answer

A) 2.4$\Omega$, parallel 
B) 2.4 $\Omega$, series 
C) 4.0 $\Omega$, parallel 
D) 4.0 $\Omega$, series 
E) 9.0 $\Omega$, series 
A) 2.4$\Omega$, parallel 
B) 2.4 $\Omega$, series 
C) 4.0 $\Omega$, parallel 
D) 4.0 $\Omega$, series 
E) 9.0 $\Omega$, series

Exam 27: Circuits

A battery of emf 24 V is connected to a 6- Ω\OmegaΩ resistor.As a result, current of 3 A exists in the resistor.The terminal potential difference of the battery is:

Resistor 1 has twice the resistance of resistor 2.The two are connected in parallel and a potential difference is maintained across the combination.The rate of thermal energy dissipation in 1 is:

Four 20- Ω\OmegaΩ resistors are connected in series and the combination is connected to a 20-V emf device.The current in any one of the resistors is:

The circuit shown was wired for the purpose of measuring the resistance of the lamp L.Inspection shows that:

In the diagrams, all light bulbs are identical and all emf devices are identical.In which circuit (I, II, III, IV, V)will the bulbs glow with the same brightness as in circuit X?

In the figure, voltmeter V1 reads 600 V, voltmeter V2 reads 580 V, and ammeter A reads 100 A.The power wasted in the transmission line connecting the power house to the consumer is:

A 120-V power line is protected by a 15-A fuse.What is the maximum number of 120 V, 500 W light bulbs that can be operated at full brightness from this line?

The resistance of resistor 1 is twice the resistance of resistor 2.The two are connected in series and a potential difference is maintained across the combination.Then:

Here is a loop equation: .What does this equation represent?

Resistances of 2.0 Ω\OmegaΩ , 4.0 Ω\OmegaΩ , and 6.0 Ω\OmegaΩ and a 24-V battery are all in series.The current in the 2.0 Ω\OmegaΩ resistor is:

A 3- Ω\OmegaΩ and a 1.5- Ω\OmegaΩ resistor are wired in parallel and the combination is wired in series to a 4- Ω\OmegaΩ resistor and a 10-V emf device.The potential difference across the 3- Ω\OmegaΩ resistor is:

A battery is connected across a parallel combination of two identical resistors.If the potential difference across the terminals is V and the current in the battery is i, then:

A 3- Ω\OmegaΩ and a 1.5- Ω\OmegaΩ resistor are wired in parallel and the combination is wired in series to a 4- Ω\OmegaΩ resistor and a 10-V emf device.The current in the 3- Ω\OmegaΩ resistor is:

In the capacitor discharge formula q = q0e-t/RC the symbol t represents:

A certain capacitor, in series with a 720- Ω\OmegaΩ resistor, is being charged.At the end of 10 ms its charge is half the final value.The capacitance is about:

The terminal potential difference of a battery is less than its emf:

A series circuit consists of a battery with internal resistance r and an external resistor R.If these two resistances are equal (r = R)then the energy dissipated per unit time by the internal resistance r is:

Two wires made of the same material have the same length but different diameter.They are connected in parallel to a battery.The quantity that is NOT the same for the wires is:

A total resistance of 3.0 Ω\OmegaΩ is to be produced by combining an unknown resistor R with a 12 Ω\OmegaΩ resistor.What is the value of R and how is it to be connected to the 12 Ω\OmegaΩ resistor?

Measurement

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Force and Motion

Force and Motion

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

Gravitation

Fluids

Oscillations

Waves

Waves

Temperature, Heat, and the First Law of Thermodynamics

The Kinetic Theory of Gases

Entropy and the Second Law of Thermodynamics

Coulombs Law

Electric Fields

Gauss Law

Electric Potential

Capacitance

Current and Resistance

Magnetic Fields

Magnetic Fields Due to Currents

Induction and Inductance

Electromagnetic Oscillations and Alternating Current

Maxwells Equations; Magnetism of Matter

Electromagnetic Waves

Images

Interference 1

Diffraction

Relativity

Photons and Matter Waves

More About Matter Waves

All About Atoms

Conduction of Electricity in Solids

Energy From the Nucleus

Quarks, Leptons, and the Big Bang

Filters

A battery of emf 24 V is connected to a 6- $\Omega$ resistor.As a result, current of 3 A exists in the resistor.The terminal potential difference of the battery is:

Four 20- $\Omega$ resistors are connected in series and the combination is connected to a 20-V emf device.The current in any one of the resistors is:

In the figure, voltmeter V₁ reads 600 V, voltmeter V₂ reads 580 V, and ammeter A reads 100 A.The power wasted in the transmission line connecting the power house to the consumer is:

Resistances of 2.0 $\Omega$ , 4.0 $\Omega$ , and 6.0 $\Omega$ and a 24-V battery are all in series.The current in the 2.0 $\Omega$ resistor is:

A 3- $\Omega$ and a 1.5- $\Omega$ resistor are wired in parallel and the combination is wired in series to a 4- $\Omega$ resistor and a 10-V emf device.The potential difference across the 3- $\Omega$ resistor is:

A 3- $\Omega$ and a 1.5- $\Omega$ resistor are wired in parallel and the combination is wired in series to a 4- $\Omega$ resistor and a 10-V emf device.The current in the 3- $\Omega$ resistor is:

In the capacitor discharge formula q = q₀e^-^t^/^RC the symbol t represents:

A certain capacitor, in series with a 720- $\Omega$ resistor, is being charged.At the end of 10 ms its charge is half the final value.The capacitance is about:

A total resistance of 3.0 $\Omega$ is to be produced by combining an unknown resistor R with a 12 $\Omega$ resistor.What is the value of R and how is it to be connected to the 12 $\Omega$ resistor?