Chapter 18 Conceptual Questions

If a quantity you calculated has units of A · s, what is that quantity?

• potential

• charge

• resistance

• capacitance

• resistivity

When current is flowing in an ordinary metal wire, the magnitude of the average velocity of the electrons is closest to

• the speed of light

• 10 m/s

• 1 km/s

• 1 m/s

• 1 mm/s

Answer explanation

ur fucking stupid if u chose speed of light

When a current flows through a metal wire, the moving charges are

• both protons and electrons

• only protons

• negative metal ions

• only electrons

• positive metal ions

When a current flows through an ionic liquid such as salty water, the moving charges are

• only negative ions

• only protons

• only positive ions

• both positive and negative ions

• only electrons

• resistivity

• charge

• potential

• capacitance

• resistance

• resistance

• capacitance

• charge

• potential

• resistivity

The figure shows electrons passing through a resistor. The arrow shows the direction in which the electrons are moving. Which of the following statements are correct? (There could be more than one correct choice.)

• The electric potential is lower at point b than at point a

• The speed of the electrons at point b is the same as it is at point a

• The electrons are moving slower at point b than at point a

• The electrons are losing electric potential energy as they move through the resistor from a to b

• The electric potential is higher at point b than at point a

The figure shows conventional current passing through a resistor. The arrow shows the direction in which this conventional current is flowing. Which of the following statements are correct? (There could be more than one correct choice.)

• The electric potential is lower at point b than at point a

• The current at point b is the same as the current at point a

• The charges are moving slower at point b than at point a

• The electric potential is higher at point b than at point a

• The electric potential at point b is the same as it is at point a

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

• power

• resistivity

• 1/(resistance)

• resistance

• 1/(resistivity)

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

• resistance

• power

• 1/(resistivity)

• 1/(resistance)

• resistivity