Electric Current

Question 1

Measurements of two electric currents are shown in the chart.

Revolt · Accepted Answer

Current Y has a greater potential difference, and the charges flow at a slower rate.

Question 2

Which two wire properties would provide the greatest resistance to the flow of a current?

Revolt · Accepted Answer

long, thin

Question 3

Which lists types of materials from most conductive to least conductive?

Revolt · Accepted Answer

superconductor, conductor, semiconductor, insulator

Question 4

Which most likely has the greatest conductivity?

Revolt · Accepted Answer

a cool silver strip

Question 5

In the diagram, the arrow shows the movement of electric charges through a wire connected to a battery.

Revolt · Accepted Answer

a difference in electric potential

Question 6

What would decrease the resistance of wires carrying an electric current?

Revolt · Accepted Answer

shorter wires

Question 7

Look at the diagram showing resistance and flow of electrons.

Revolt · Accepted Answer

X: Low potential energyY: High potential energyZ: Flow of electrons

Question 8

The chart shows the voltage of four electric currents.

Revolt · Accepted Answer

Current X has a lower potential difference than Current Y.

Question 9

Superconducting magnets are used in machines called particle accelerators. These machines rely on zero resistance in order to function properly.

Revolt · Accepted Answer

They are cooled to extremely low temperatures.

Question 10

Why is copper used for most electrical wiring?

Revolt · Accepted Answer

It is a good conductor.

Electric Current Answers