I=nAvq

In an electric circuit, once the switch is closed what is the best approximation for the speed at which the energy transfers from the energy provider to the energy user?

• Speed of electromagnetic waves

• about 1/2 the speed of light

• about 1mm/s

• about the speed of sound

• at thermal speeds of 1% the speed of light

What is/are approximate values for the drift velocity of electrons through a metal conductor?

• speed of electromagnetic radiation

• about half the speed of light

• about 1mm/s

• about 1m/hr

• electron thermal speeds of 1% the speed of light

In the equation I = nAvq, what does v represent?

• The speed of the electrons

• The average speed of the electrons

• The velocity of the electrons

• The average velocity of the electrons

• the fastest speed of all electrons

In the equation I=nAvq, which option(s) describe the meaning of n?

• the charge carrier density

• the number of charge carriers per unit volume

• the number of charge carriers per m³

• the number of charge carriers in the wires

• the total charge carriers available in the battery

When a thick wire is connected in series with a thin wire of the same material which of the below is/are true?

• The current through the thick wire is greater than the current through the thin wire

• The electrons move slower through the thin wire than through the thick wire

• The number of charge carriers per unit volume is greater in the thick wire than in the thin wire

• The number of charges flowing per second past a cross section of the thick wire is the same as that flowing past a cross section of the thin wire

When a semiconducting and metallic wire of the same diameter are connected in series which of the below is/are true?

• The current in the semiconductor is greater than that in the metal

• The electrons move faster in the semiconductor

• The semiconductor has a lower value of n

• Each charge carrier in the semiconductor carries more charge than the charge carriers in the metal

If the current in a specific copper wire increases this can be due to _____________________.

• An increase in the charge carrier density

• An increase in the electron drift speed

• An increase in its cross sectional area

• An increase in the charge of electrons

If the current in a conductor were to remain the same, what effect will doubling the charge carrier density have?

• Double the charge per charge carrier in the material

• Halve the average drift speed of the electrons

• Halve the cross sectional area of the wire