Exam 5 - electricity

Which choice can be correctly defined as “the sum of all charges in a closed system remains constant”?

• law of conservation of mass

• law of conservation of momentum

• law of conservation of energy

• law of conservation of charge

Study the image of two objects with initial charge. When the objects interact, which option indicates a possible net charge for each object?

• Object A: -2, Object B: +2

• Object A: +1, Object B: +1

• Object A: +5, Object B: +3

• Object A: +8, Object B: +6

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

When the two objects come in contact, which choice most accurately describes the behavior of electric charges?

• Some protons move from the positively charged object to the neutral object. The neutral object becomes positively charged. The object that was initially charged becomes neutral.

• Some electrons move from the neutral object to the positively charged object. Both objects become positively charged, but the object that started positively charged is less positively charged than it was initially.

• Some protons move from the positively charged object to the neutral object. Both objects become positively charged, but the object that started positively charged is less positively charged than it was initially.

• Some electrons move from the neutral object to the positively charged object. The neutral object becomes positively charged. The object that was initially charged becomes neutral.

Tags

NGSS.HS-PS3-5

If the arrows show the direction of the electric field, which choice most accurately describes the behavior of the proton in the field?

• The proton would move with constant velocity downward.

• The proton would accelerate upward.

• The proton would move with constant velocity upward.

• The proton would accelerate downward.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Examine the scenario.

A charged particle is placed in Object A’s electric field.

Which choice correctly describes a factor that would strengthen the force the particle experiences in the electric field?

• Decrease the magnitude of the charge of Object A.

• Increase the mass of the particle.

• Increase the distance between the particle and Object A.

• Bring the particle closer to Object A.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which option correctly defines an electric current?

• the movement of protons due to a difference in elevation between two points in a circuit

• the movement of electrons due to a potential difference between two points in a circuit

• the movement of protons due to a potential difference between two points in a circuit

• the movement of electrons due to a difference in elevation between two points in a circuit

Which choice most accurately describes voltage?

• the amount of charge moving through a point in a circuit every second

• the amount of work required to move 1 C of charge between two points

• the amount of electrical energy converted every second

• the amount of electrical energy in a circuit

Examine the scenario.

A circuit is made up of a battery, wires, and two light bulbs. There are multiple pathways for the current to go through the circuit.

Which option most accurately identifies the type of circuit described?

• It is a series circuit because there are multiple pathways for the current to flow.

• It is a series circuit because there are multiple light bulbs in the circuit.

• It is a parallel circuit because there are multiple pathways for the current to flow.

• It is a parallel circuit because there are multiple light bulbs in the circuit.

A circuit is arranged so that 6 A of current is flowing through it. If the voltage is then tripled, which option correctly describes the effect on the current?

• When the voltage is tripled, there is no change in the amount of energy to move 1 C of charge. There is also no effect on the amount of current moving through the circuit. The amount of current moving through the circuit will stay the same.

• When the voltage is tripled, there is a smaller amount of energy to move 1 C of charge. So that amount of current will reduce to 1/3 of the original current. As voltage increases, the current decreases.

• When the voltage is tripled, there is a greater amount of energy to move 1 C of charge, so the amount of current will triple as well. As the current increases, the voltage also increases.

• When the voltage is tripled, there is a greater amount of energy to move 1 C of charge, but also a greater amount of resistance. So the amount of current will not be affected by a change in the voltage.

If a battery-operated car has a resistance of 3 Ω and the current moving through it is 2 amps, what is the voltage of the battery?

• 0.67 V

• 1 V

• 1.5 V

• 6 V