Electric Current

Electric current is the flow of charged particles called ________

• protons

• electrons

• atoms

Look at the diagram showing resistance and flow of electrons. Which labels best complete the diagram?

• X: High resistance Y: Low resistance Z: Flow of electrons

• X: Low resistance Y: Flow of electrons Z: High resistance

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

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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 balance in electric potential

• a difference in electric potential

• a balance in resistance

The chart shows the voltage of four electric currents. Which is best supported by the data in the chart?

• Current W flows at a higher rate than Current Z.

• Current Y flows at a lower rate than Current X.

• Current X has a lower potential difference than Current Y.

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Measurements of two electric currents are shown in the chart. Which best compares the two currents?

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

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

• Current X has a greater potential difference, and the charges flow at a faster rate.

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NGSS.MS-PS2-3

Resistance depends on which three properties of a wire?

Color and texture are not directly related to a wire’s resistance.

• color, thickness, texture

• thickness, length, temperature

• length, texture, temperature

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

• shorter wires

• higher-temperature wires

• darker-colored wires

Which best explains why an electric toaster is considered a resistor?

• It increases the flow of electrons.

• It acts as a conductor.

• It converts electric energy to another form of energy.

Electric current flows through paths called circuits. People often build circuits using wires, resistors, and batteries. A battery is a voltage source. A circuit with which components has a current with the greatest voltage?

• wires, a 9V battery, no resistors

• wires, a 9V battery, a light bulb

• wires, a 1.5V battery, no resistors

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

• short, thin

• long, thin

• hot, thick