Voltage, Current, and Resistance

The potential difference between two points, A and B, in an electric field is 2.00 volts. The energy required to move a charge of 8.00 x 10^-19 coulomb from point A to point B is

• 2.50 x 10¹⁸ J

• 1.60 x 10^-18 J

• 6.25 x 10¹⁷ J

• 4.00 x 10^-19 J

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Copper is a metal commonly used for electrical wiring in houses. Which metal conducts electricity better than copper at 20^oC?

• nichrome

• gold

• silver

• aluminum

The diagrams above represent four pieces of copper wire at 20.^oC. For each piece of wire, L represents a unit of length and A represents a unit of cross-sectional area.

The piece of wire that has the greatest resistance is

• wire 1

• wire 2

• wire 3

• wire 4

How much work is required to move 3.0 coulombs of electric charge a distance of 0.010 meter through a potential difference of 9.0 volts?

• 3.0 x 10^-2 J

• 3.0 J

• 27 J

• 2.7 x 10³ J

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The electronvolt is a unit of

• energy

• electric potential difference

• charge

• electric field strength

Which combination of units can be used to express electrical energy?

• $volt\ \times\ coulomb\ \times\sec ond$

• $volt\times coulomb$

• $\frac{coulomb}{volt}$

• $\frac{volt}{coulomb}$

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Which object will have the greatest change in electrical energy?

• an electron moved through a potential difference of 4.0 V

• a metal sphere with a charge of 1.0 x 10^-9 C moved through a potential difference of 2.0 V

• a metal sphere with a charge of 1.0 x 10^-9 C moved through a potential difference of 4.0 V

• an electron moved through a potential difference of 2.0 V

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Moving 4.0 coulombs of charge through a circuit requires 48 joules of electric energy. What is the potential difference across this circuit?

• 190 V

• 12 V

• 4.0 V

• 48 V

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An MP3 player draws a current of 0.120 ampere from a 3.00-volt battery. What is the total charge that passes through the player in 900. seconds?

• 324 C

• 108 C

• 1.80 C

• 5.40 C

What is the current in a wire if 3.4 x 10¹⁹ electrons pass by a point in this wire every 60. seconds?

• 11 A

• 3.1 x 10^-11 A

• 9.1 x 10^-2 A

• 1.8 x 10^-18 A