Question 1

Electrons are made to drift through a metal conductor due to&#10;A) their attraction to an external positive charge and repulsion by an external negative charge&#10;B) their attraction to an external negative charge and repulsion by an external positive charge&#10;C) the chemical effect of the current&#10;D) the difference in pressure between opposite ends of the conductor

Accepted Answer

Electrons move through a metal conductor primarily due to their attraction to an external positive charge and repulsion by an external negative charge. This movement is driven by the electric field established across the conductor when a potential difference (voltage) is applied, causing electrons to drift from the negative to the positive terminal.

Question 2

The area surrounding a stationary electric charge, in which the effects of that charge may be observed is called&#10;A) a gravitational field&#10;B) a magnetic field&#10;C) an electric field&#10;D) a force field

Accepted Answer

The area surrounding a stationary electric charge, in which the effects of that charge may be observed, is called an electric field. This field exerts a force on other electrically charged objects within its influence. This phenomenon is fundamental to the behavior of electricity and is used in many practical applications, such as electric motors, generators, and electronics. Choices A and B are incorrect because gravitational and magnetic fields are different types of fields that are associated with other fundamental forces, namely gravity and magnetism, respectively. Choice D is also incorrect because "force field" is a vague term that could refer to any type of field that exerts a force.

Question 3

Moving a negative charge in the direction of the field, described above, will&#10;A) increase the potential of that charge&#10;B) decrease the potential of that charge&#10;C) have no effect on the potential of that charge&#10;D) reverse the polarity of that charge

Accepted Answer

Moving a negative charge in the direction of the electric field increases its electric potential energy, thus increasing its potential.

Question 4

A potential difference exists between charges located at&#10;A) different points within a magnetic field&#10;B) different points within an electric field&#10;C) opposite ends of a conductor&#10;D) different heights above the ground

Accepted Answer

A potential difference exists between charges located at different points within an electric field. This is because an electric field exerts a force on charges, causing them to move from one point to another. The work done in moving the charges against this force creates a potential difference between the two points.

Question 5

An object that has acquired a 'positive' potential&#10;A) has less electrons than protons&#10;B) is less negative than another object&#10;C) can be either a or b&#10;D) is neither a nor b

Accepted Answer

An object with a 'positive' potential can indeed have fewer electrons than protons, making it positively charged (A), and it can also be considered less negative compared to another object, indicating a relative difference in charge or potential (B). Thus, both A and B are correct, making C the accurate choice.

Question 6

The unit for potential difference, the volt, is defined in terms of&#10;A) the work done in moving a charge between two points&#10;B) the difference in charge between two points&#10;C) the difference in energy between two points&#10;D) the difference in energy between a point and that of earth

Accepted Answer

The volt is defined as the potential difference between two points in a circuit when one joule of energy is expended in moving one coulomb of charge between those two points. Therefore, it is defined in terms of the work done (one joule) in moving a charge (one coulomb) between two points.

Question 7

Voltage' is another term for&#10;A) potential&#10;B) potential difference&#10;C) electromotive force&#10;D) energy-difference

Accepted Answer

Voltage is also known as potential difference, which is the difference in electric potential between two points in a circuit. While A, C, and D are related to voltage, they are not synonyms for voltage. "Potential" refers to the electric potential at a specific point, "electromotive force" refers to the energy per unit charge required to move charge through a circuit, and "energy-difference" is a vague term that could refer to a variety of concepts in physics.

Question 8

The earth is generally considered to have a _______ of zero volts&#10;A) potential&#10;B) potential difference&#10;C) electromotive force&#10;D) energy level

Accepted Answer

A potential of zero volts means that no work is required to move a charge from one point on earth to another. This is because earth is often considered to be at "ground" potential, which serves as a reference point for measuring the potential difference between two points.

Question 9

The nominal __________ between the line and neutral of a 13-A socket outlet is 230 V&#10;A) voltage&#10;B) voltage difference&#10;C) voltage drop&#10;D) potential

Accepted Answer

The nominal value refers to the specified value of a quantity, in this case, the voltage between the line and neutral of a 13-A socket outlet. Therefore, the appropriate term is "voltage." The other options are not correct because there is no voltage difference or voltage drop between the line and neutral, and potential is a more general term that could refer to voltage, energy, or other quantities.

Question 10

A line conductor has a nominal __________ of 230 V with respect to the neutral conductor&#10;A) voltage&#10;B) voltage difference&#10;C) electromotive force&#10;D) potential

Accepted Answer

The answer of A line conductor has a nominal __________...

Question 11

A battery aquires a potential difference across its terminals due to&#10;A) its stored charge&#10;B) charge separation&#10;C) the type of electrolyte used&#10;D) electrolysis

Accepted Answer

The answer of A battery aquires a potential difference across...

Deck 3: Potential and Potential Difference