Correct answer: A

The correct answer is A property that causes electric interactions and can be positive or negative.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Charge produces electric forces, is measured in coulombs, and is conserved in an isolated system.
3. Check units and direction: The correct answer is A property that causes electric interactions and can be positive or negative.

Correct answer: B

The correct answer is $V=IR$.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Voltage equals current times resistance, so $I=V/R$ when resistance is constant.
3. Check units and direction: The correct answer is $V=IR$.

Correct answer: C

The correct answer is Current.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: There is one path in a series circuit, so the same current passes through each component.
3. Check units and direction: The correct answer is Current.

Correct answer: D

The correct answer is Potential difference or voltage.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Each branch connects across the same two nodes, so each branch has the same voltage.
3. Check units and direction: The correct answer is Potential difference or voltage.

Correct answer: A

The correct answer is $P=IV$.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Electrical power is voltage times current; using Ohm's law also gives $P=I^2R$ or $P=V^2/R$.
3. Check units and direction: The correct answer is $P=IV$.

Correct answer: B

The correct answer is The force per unit positive test charge.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Electric field is defined by $\vec E=\vec F/q$ for a positive test charge.
3. Check units and direction: The correct answer is The force per unit positive test charge.

Correct answer: C

The correct answer is The change in electric potential energy per unit charge.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Voltage is energy transferred per charge: $V=\Delta U/q$.
3. Check units and direction: The correct answer is The change in electric potential energy per unit charge.

Correct answer: D

The correct answer is $\vec F=q\vec v\times\vec B$.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: The magnetic force is perpendicular to velocity and field, with magnitude $F=qvB\sin\theta$.
3. Check units and direction: The correct answer is $\vec F=q\vec v\times\vec B$.

Correct answer: A

The correct answer is The direction of a magnetic field, current, or magnetic force.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Right-hand rules connect the directions of current, magnetic field, velocity, and magnetic force.
3. Check units and direction: The correct answer is The direction of a magnetic field, current, or magnetic force.

Correct answer: B

The correct answer is The production of an emf by changing magnetic flux.

1. Identify the physics model: Determine whether the problem concerns motion, force, energy, momentum, waves, electricity, magnetism, or experimental data.
2. Apply the relationship: Faraday's law connects induced emf to the rate of change of magnetic flux through a loop.
3. Check units and direction: The correct answer is The production of an emf by changing magnetic flux.