A certain electrical circuit contains a battery with three cells, wires and a light bulb. Which of the following would cause the bulb to shine less brightly? Choose all that apply.

decrease the voltage of the battery (remove a cell)

increase the resistance of the circuit

increase the voltage of the battery (add another cell)

decrease the resistance of the circuit

You have likely been warned to avoid contact with electrical appliances or even electrical outlets when your hands are wet. Such contact is more dangerous when your hands are wet (vs. dry) because wet hands cause ____.

the voltage of the circuit to be higher

the voltage of the circuit to be lower

the current through you to be lower

If the resistance of a circuit were tripled, then the current through the circuit would be ____.

.. nonsense! There would be no way to make such a prediction

If the voltage across a circuit is quadrupled, then the current through the circuit would be ____.

... nonsense! There would be no way to make such a prediction.

the ratio of the magnitude of the charge on either conductor of a capacitor to the magnitude of the potential difference between the conductors.

constant for a parallel-plate capacitor.

To increase the capacitance of a parallel-plate capacitor, you can

increase the area of the plates.

increase the distance between the plates.

Select the option that best describes a dielectric.

A dielectric is a nonconducting material.

A dielectric is the material when placed between the plates of a capacitor will increase the electric field.

A dielectric is something that when placed between the plates decreases the capacitance of a capacitor.

What is the equation for the equivalent capacitance for two capacitors connected in parallel?

C e q = C 1 + C 2 C_{eq}=C_1+C_2 C e q = C 1 + C 2

C e q = ( 1 C 1 + 1 C 2 + 1 C 3 ) − 1 C_{eq}=\left(\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}\right)^{-1} C e q = ( C 1 1 + C 2 1 + C 3 1 ) − 1

C e q = ( 1 C 1 + 1 C 2 ) − 1 C_{eq}=\left(\frac{1}{C_1}+\frac{1}{C_2}\right)^{-1} C e q = ( C 1 1 + C 2 1 ) − 1

C e q = C 1 + C 2 + C 3 C_{eq}=C_1+C_2+C_3 C e q = C 1 + C 2 + C 3

What is the equation for the equivalent capacitance for three capacitors connected in series?

C e q = ( 1 C 1 + 1 C 2 + 1 C 3 ) − 1 C_{eq}=\left(\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}\right)^{-1} C e q = ( C 1 1 + C 2 1 + C 3 1 ) − 1

C e q = ( 1 C 1 + 1 C 2 ) − 1 C_{eq}=\left(\frac{1}{C_1}+\frac{1}{C_2}\right)^{-1} C e q = ( C 1 1 + C 2 1 ) − 1

C e q = C 1 + C 2 + C 3 C_{eq}=C_1+C_2+C_3 C e q = C 1 + C 2 + C 3

C e q = C 1 + C 2 C_{eq}=C_1+C_2 C e q = C 1 + C 2

What is the equation for the equivalent resistance for three resistors connected in series?

R e q = R 1 + R 2 + R 3 R_{eq}=R_1+R_2+R_3 R e q = R 1 + R 2 + R 3

R e q = ( 1 R 1 + 1 R 2 + 1 R 3 ) − 1 R_{eq}=\left(\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}\right)^{-1} R e q = ( R 1 1 + R 2 1 + R 3 1 ) − 1

R e q = ( 1 R 1 + 1 R 2 ) − 1 R_{eq}=\left(\frac{1}{R_1}+\frac{1}{R_2}\right)^{-1} R e q = ( R 1 1 + R 2 1 ) − 1

R e q = R 1 + R 2 R_{eq}=R_1+R_2 R e q = R 1 + R 2

What is the equation for the equivalent resistance for two resistors connected in parallel?

R e q = ( 1 R 1 + 1 R 2 ) − 1 R_{eq}=\left(\frac{1}{R_1}+\frac{1}{R_2}\right)^{-1} R e q = ( R 1 1 + R 2 1 ) − 1

R e q = ( 1 R 1 + 1 R 2 + 1 R 3 ) − 1 R_{eq}=\left(\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}\right)^{-1} R e q = ( R 1 1 + R 2 1 + R 3 1 ) − 1

R e q = R 1 + R 2 + R 3 R_{eq}=R_1+R_2+R_3 R e q = R 1 + R 2 + R 3

R e q = R 1 + R 2 R_{eq}=R_1+R_2 R e q = R 1 + R 2

A 541-Watt toaster is connected to a 120-V household outlet. What is the resistance (in ohms) of the toaster?

26.6 Ω 26.6\ \Omega 2 6 . 6 Ω

72.9 Ω 72.9\ \Omega 7 2 . 9 Ω

55.8 Ω 55.8\ \Omega 5 5 . 8 Ω

13.2 Ω 13.2\ \Omega 1 3 . 2 Ω

Use the chart to determine the value of the resistor shown in the picture.

270 k Ω 270\ k\Omega 2 7 0 k Ω

300 k Ω 300\ k\Omega 3 0 0 k Ω

557 k Ω 557\ k\Omega 5 5 7 k Ω

190 k Ω 190\ k\Omega 1 9 0 k Ω

To maximize the percentage of the power from the emf of a battery that is delivered to a device external to the battery, what should the internal resistance of the battery be?

it should be as low as possible

it should be as high as possible

the percentage does not depend on the internal resistance

A battery is used to light two bulbs as shown. What happens to bulb B when bulb A is unscrewed from its socket?

Bulb B's brightness stays the same.

Bulb B gets noticeably dimmer, without going out.

The radius of 22-gauge Nichrome wire is 0.32 mm. Calculate the resistance per unit length of this wire.

3.1 Ω m 3.1\ \frac{\Omega}{m} 3 . 1 m Ω

1.1 Ω m 1.1\ \frac{\Omega}{m} 1 . 1 m Ω

6.9 Ω m 6.9\ \frac{\Omega}{m} 6 . 9 m Ω

1.6 Ω m 1.6\ \frac{\Omega}{m} 1 . 6 m Ω

Review

Authored by Patrice Edwards

Physics

12th Grade - University

Used 52+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When dealing with resistors, in a Series Circuit, which of the following quantities remain the same throughout the circuit:

current

voltage

current and voltage

none of the above

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When dealing with resistors, in parallel circuit, which of the following quantities remain the same throughout the circuit:

current

voltage

current and voltage

none of the above

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If a set of electrical bulbs are to be connected in series or parallel configuration, in which configuration does the bulbs glow brighter:

series

parallel

brightness does not depend on the bulb configuration

the Pauli configuration

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

As more resistors are added in series, the equivalent resistance of the circuit approaches infinity. In contrast, as more resistors are added in parallel, the equivalent resistance

approaches infinity

approaches zero

becomes zero

$approaches\ 1\ \Omega$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Appliances with three-pronged plugs compared to those with two-prong plugs are

safer to use and connected to ground

no safer to use and ungrounded

more dangerous to use and connected to ground

safer to use and ungrounded

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

True or False: While discharging, the terminal voltage of a battery can never be greater than the emf of the battery.

true

false

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the figure, the current is measured with the ammeter at the bottom of the circuit. When the switch is opened, the reading on the ammeter

increases

decreases

does not change

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Review

When dealing with resistors, in a Series Circuit, which of the following quantities remain the same throughout the circuit:

When dealing with resistors, in parallel circuit, which of the following quantities remain the same throughout the circuit:

If a set of electrical bulbs are to be connected in series or parallel configuration, in which configuration does the bulbs glow brighter:

As more resistors are added in series, the equivalent resistance of the circuit approaches infinity. In contrast, as more resistors are added in parallel, the equivalent resistance

Appliances with three-pronged plugs compared to those with two-prong plugs are

True or False: While discharging, the terminal voltage of a battery can never be greater than the emf of the battery.

In the figure, the current is measured with the ammeter at the bottom of the circuit. When the switch is opened, the reading on the ammeter

The circuit in the figure below consists of two resistors, a switch, an ammeter, and a battery. When the switch is closed, power Pc is delivered to resistor R1. When the switch is opened, which of the following statements is true about the power Po delivered to R1?

In the figure below, the current is measured with the ammeter on the right side of the circuit diagram. When the switch is closed, the reading on the ammeter

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