Question 1

The characteristics of five wires are given in the table.
  The gauge is a measure of the diameter of the wire; and #18 corresponds to a diameter of 1.2 × 10S1U1P1-S1S1P0S1U1P13S1S1P0 m; and #22 corresponds to a diameter of 6.4 × 10S1U1P1-S1S1P0S1U1P14S1S1P0 m.The resistivity of iron is 9.7 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$ . m; and the value for copper is 1.72 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$. m.
-Which one of the five wires has the largest resistance?

Accepted Answer

A

Question 2

Which one of the following statements concerning superconductors is false?

Accepted Answer

The statement "All materials are superconducting at temperatures near absolute zero kelvin" is false. While many materials exhibit superconductivity at very low temperatures, not all materials become superconducting near absolute zero.

Question 3

A 3.5-A current is maintained in a simple circuit with a total resistance of 1500  $\Omega$.What net charge passes through any point in the circuit during a thirty second interval?

Accepted Answer

A

Question 4

The potential difference across the ends of a wire is doubled in magnitude.If Ohm's law is obeyed, which one of the following statements concerning the resistance of the wire is true?

Accepted Answer

According to Ohm's law, resistance is the ratio of potential difference (V) to current (I), or R = V/I. If the potential difference is doubled while current remains constant, the resistance does not change.

Question 5

The resistivity of a silver wire with a radius of 5.04 × 10^-⁴ m is 1.59 × 10^-⁸ $\Omega$. m.If the length of the wire is 3.00 m, what is the resistance of the wire?

Accepted Answer

The answer of The resistivity of a silver wire with...

Question 6

The characteristics of five wires are given in the table.
  The gauge is a measure of the diameter of the wire; and #18 corresponds to a diameter of 1.2 × 10S1U1P1-S1S1P0S1U1P13S1S1P0 m; and #22 corresponds to a diameter of 6.4 × 10S1U1P1-S1S1P0S1U1P14S1S1P0 m.The resistivity of iron is 9.7 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$ . m; and the value for copper is 1.72 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$. m.
-Which one of the wires carries the smallest current when they are connected to identical batteries?

Accepted Answer

The answer of  
The characteristics of five wires are...

Question 7

The characteristics of five wires are given in the table.
  The gauge is a measure of the diameter of the wire; and #18 corresponds to a diameter of 1.2 × 10S1U1P1-S1S1P0S1U1P13S1S1P0 m; and #22 corresponds to a diameter of 6.4 × 10S1U1P1-S1S1P0S1U1P14S1S1P0 m.The resistivity of iron is 9.7 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$ . m; and the value for copper is 1.72 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$. m.
-Complete the following statement: The unit kilowatt . hour measures

Accepted Answer

The unit kilowatt hour measures energy, which is the amount of work done over a period of time. It is commonly used to measure the consumption and billing of electricity.

Question 8

When a light bulb is connected to a 4.5 V battery, a current of 0.12 A passes through the bulb filament.What is the resistance of the filament?

Accepted Answer

The answer of When a light bulb is connected to...

Question 9

A 4-A current is maintained in a simple circuit with a total resistance of 2  $\Omega$.How much energy is delivered in forty five seconds?

Accepted Answer

The answer of A 4-A current is maintained in a...

Question 10

Which one of the following statements concerning resistance is true?

Accepted Answer

The resistance of a metal wire changes with temperature. This is because as the temperature of a metal wire increases, the atoms in the wire vibrate more vigorously, which causes more collisions between electrons and atoms, leading to an increase in resistance.

Question 11

The current through a certain heater wire is found to be fairly independent of its temperature.If the current through the heater wire is doubled, the amount of energy delivered by the heater in a given time interval will

Accepted Answer

The energy delivered by a heater is given by the formula E=I^2Rt, where I is the current, R is the resistance, and t is the time. Since the current is doubled and the resistance is assumed to be constant, the energy delivered is proportional to the square of the current: E∝I^2. Therefore, if the current through the heater wire is doubled, the energy delivered by the heater in a given time interval will increase by a factor of 4.

Question 12

The characteristics of five wires are given in the table.
  The gauge is a measure of the diameter of the wire; and #18 corresponds to a diameter of 1.2 × 10S1U1P1-S1S1P0S1U1P13S1S1P0 m; and #22 corresponds to a diameter of 6.4 × 10S1U1P1-S1S1P0S1U1P14S1S1P0 m.The resistivity of iron is 9.7 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$ . m; and the value for copper is 1.72 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$. m.
-Of the five wires, which one has the smallest resistance?

Accepted Answer

To determine the resistance of each wire, we use the formula R = (ρL)/A, where ρ is the resistivity, L is the length of the wire, and A is the cross-sectional area (πr^2 for a circular wire). We can assume that all wires have the same length for simplicity.

Using the given gauge sizes, we can calculate the radii for each wire:

Wire A: r = 1.2 × 10^-3/2 = 0.0006 m
Wire B: r = 1.0 × 10^-3/2 = 0.0005 m
Wire C: r = 0.8 × 10^-3/2 = 0.0004 m
Wire D: r = 0.6 × 10^-3/2 = 0.0003 m
Wire E: r = 0.4 × 10^-3/2 = 0.0002 m

Using the resistivity values given, we can calculate the resistance of each wire:

Wire A: R = (9.7 × 10^-8)(L)/(π(0.0006)^2) = 2.42 × 10^-4 L
Wire B: R = (9.7 × 10^-8)(L)/(π(0.0005)^2) = 3.86 × 10^-4 L
Wire C: R = (1.72 × 10^-8)(L)/(π(0.0004)^2) = 1.74 × 10^-4 L
Wire D: R = (1.72 × 10^-8)(L)/(π(0.0003)^2) = 3.87 × 10^-4 L
Wire E: R = (1.72 × 10^-8)(L)/(π(0.0002)^2) = 1.94 × 10^-3 L

Since we are looking for the wire with the smallest resistance, we can compare the coefficients in front of L for each wire. The smallest coefficient is 1.74 × 10^-4, which corresponds to wire C. Therefore, the answer is D, wire C, has the smallest resistance.

Question 13

How many electrons flow through a battery that delivers a current of 3.0 A for 12 s?

Accepted Answer

The answer of How many electrons flow through a battery...

Question 14

A physics student performed an experiment in which the potential difference V between the ends of a long straight wire was varied.The current I in the wire was measured at each value of the potential difference with an ammeter and the results of the experiment are shown in the table.  Which one of the following statements is the best conclusion based on the data?

Accepted Answer

The answer of A physics student performed an experiment in...

Question 15

Which one of the following circuits has the largest resistance?

Accepted Answer

The answer of Which one of the following circuits has...

Question 16

Which one of the following combinations of units is equivalent to the ohm?

Accepted Answer

The answer of Which one of the following combinations of...

Question 17

Complete the following statement: The electromotive force is

Accepted Answer

The electromotive force (EMF) is the maximum potential difference between the terminals of a battery or any other source of electric energy. It is a measure of the electrical energy that can be obtained from a device such as a battery, generator or solar cell.

Question 18

The characteristics of five wires are given in the table.
  The gauge is a measure of the diameter of the wire; and #18 corresponds to a diameter of 1.2 × 10S1U1P1-S1S1P0S1U1P13S1S1P0 m; and #22 corresponds to a diameter of 6.4 × 10S1U1P1-S1S1P0S1U1P14S1S1P0 m.The resistivity of iron is 9.7 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$ . m; and the value for copper is 1.72 × 10S1U1P1-S1S1P0S1U1P18S1S1P0  $\Omega$. m.
-Which one of the following quantities can be converted to kilowatt . hours (kWh)?

Accepted Answer

The answer of  
The characteristics of five wires are...

Question 19

Which one of the following situations results in a conventional electric current that flows northward?

Accepted Answer

The answer of Which one of the following situations results...

Question 20

Determine the length of a copper wire that has a resistance of 0.172 $\Omega$ and cross-sectional area of 7.85 × 10^-⁵ m².The resistivity of copper is 1.72 × 10^-⁸ $\Omega$. m.

Accepted Answer

We can use the formula for resistance of a wire, R = (ρL)/A, where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area.

Rearranging the formula to solve for L, we get L = (RA)/ρ.

Substituting the given values, we get:

L = (0.172 x 7.85 x 10^-12) / (1.72 x 10^-8) = 785 meters (approximately)

Therefore, the answer is D) 785 m.

Quiz 20: Electric Circuits

Which one of the following statements concerning superconductors is false?

A 3.5-A current is maintained in a simple circuit with a total resistance of 1500 $\Omega$ .What net charge passes through any point in the circuit during a thirty second interval?

The potential difference across the ends of a wire is doubled in magnitude.If Ohm's law is obeyed, which one of the following statements concerning the resistance of the wire is true?

The resistivity of a silver wire with a radius of 5.04 × 10^-⁴ m is 1.59 × 10^-⁸ $\Omega$ . m.If the length of the wire is 3.00 m, what is the resistance of the wire?

When a light bulb is connected to a 4.5 V battery, a current of 0.12 A passes through the bulb filament.What is the resistance of the filament?

A 4-A current is maintained in a simple circuit with a total resistance of 2 $\Omega$ .How much energy is delivered in forty five seconds?

Which one of the following statements concerning resistance is true?

The current through a certain heater wire is found to be fairly independent of its temperature.If the current through the heater wire is doubled, the amount of energy delivered by the heater in a given time interval will

How many electrons flow through a battery that delivers a current of 3.0 A for 12 s?

Which one of the following circuits has the largest resistance?

Which one of the following combinations of units is equivalent to the ohm?

Complete the following statement: The electromotive force is

Which one of the following situations results in a conventional electric current that flows northward?

Determine the length of a copper wire that has a resistance of 0.172 $\Omega$ and cross-sectional area of 7.85 × 10^-⁵ m².The resistivity of copper is 1.72 × 10^-⁸ $\Omega$ . m.

Quiz 20: Electric Circuits

Which one of the following statements concerning superconductors is false?

A 3.5-A current is maintained in a simple circuit with a total resistance of 1500 Ω\OmegaΩ .What net charge passes through any point in the circuit during a thirty second interval?

The potential difference across the ends of a wire is doubled in magnitude.If Ohm's law is obeyed, which one of the following statements concerning the resistance of the wire is true?

The resistivity of a silver wire with a radius of 5.04 × 10-4 m is 1.59 × 10-8 Ω\OmegaΩ . m.If the length of the wire is 3.00 m, what is the resistance of the wire?

When a light bulb is connected to a 4.5 V battery, a current of 0.12 A passes through the bulb filament.What is the resistance of the filament?

A 4-A current is maintained in a simple circuit with a total resistance of 2 Ω\OmegaΩ .How much energy is delivered in forty five seconds?

Which one of the following statements concerning resistance is true?

The current through a certain heater wire is found to be fairly independent of its temperature.If the current through the heater wire is doubled, the amount of energy delivered by the heater in a given time interval will

How many electrons flow through a battery that delivers a current of 3.0 A for 12 s?

Which one of the following circuits has the largest resistance?

Which one of the following combinations of units is equivalent to the ohm?

Complete the following statement: The electromotive force is

Which one of the following situations results in a conventional electric current that flows northward?

Determine the length of a copper wire that has a resistance of 0.172 Ω\OmegaΩ and cross-sectional area of 7.85 × 10-5 m2.The resistivity of copper is 1.72 × 10-8 Ω\OmegaΩ . m.

A 3.5-A current is maintained in a simple circuit with a total resistance of 1500 $\Omega$ .What net charge passes through any point in the circuit during a thirty second interval?

The resistivity of a silver wire with a radius of 5.04 × 10^-⁴ m is 1.59 × 10^-⁸ $\Omega$ . m.If the length of the wire is 3.00 m, what is the resistance of the wire?

A 4-A current is maintained in a simple circuit with a total resistance of 2 $\Omega$ .How much energy is delivered in forty five seconds?

Determine the length of a copper wire that has a resistance of 0.172 $\Omega$ and cross-sectional area of 7.85 × 10^-⁵ m².The resistivity of copper is 1.72 × 10^-⁸ $\Omega$ . m.