Electric Current

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

Shorter wires

Measurements of two electric currents are shown in the chart.

Which best compares the two currents?

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

Look at the diagram showing resistance and flow of electrons.

Which labels best complete the diagram?

X: Low potential energy Y: High potential energy Z: Flow of electrons

Electric current is the flow of charged particles called ________

Electrons.

Jodi made a list about electric current to help her study for a test.

1) Movement of electrons is continuous in a current.

2) Electrons move from areas of low to high electric potential.

3) Voltage causes current to flow.

4) Rate at which current flows is measured in amperes.

Which best describes Jodi's error?

Electrons move from areas of high to low electric potential.

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

Superconductor, conductor, semiconductor, insulator

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

What causes the electric charges to flow from one end of the battery to the other?

A difference in electric potential

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

long, thin

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

How are the magnets able to have zero resistance?

They are cooled to extremely low temperatures.