Current, Resistance, and Circuits

Question 1

If we monitor a point on a wire where there is a current for a certain time interval, which gives the charge that moves through the point in that interval?

Answer 1

the product of the current and the time interval

Question 2

A junction point in the wire of a circuit has inward current of 5.0 A. Which is true?

Answer 2

The outward current must be 5.0 A.

Question 3

When the current density in a wire is uniform, which gives the amount of current through a cross section of the wire?

Answer 3

the product of the cross-sectional area and the current density

Question 4

A battery is connected to a wire. If we think of current in the wire as being the motion of conduction electrons, which describes that motion?

Answer 4

The electrons move in the direction opposite the current arrow.

Question 5

the formula of resistance

Answer 5

Resistance is the ratio of the potential difference to the current.

Question 6

For most materials, how does an increase in temperature affect the resistivity?

Answer 6

increases

Question 7

If we increase the electric field magnitude along a wire, what happens to the current density?

Answer 7

increases

Question 8

The net potential change around a closed circuit loop is

Answer 8

zero

Question 9

Which is true about moving through a resistor that is connected to a battery?

Answer 9

If you move against the current, the potential increases.

Question 10

Which is true about moving through an emf device that is connected to a resistor?

Answer 10

If you move in the direction of the emf arrow, the potential increases.