4.1.5 Electrical Potential

4.1.5 Electrical Potential

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​Calculating Potential Difference

​•Amount of potential difference:

•WORK DONE PER UNIT CHARGE

•1 VOLT = 1 J/C

Multiple Choice

Example 1: 6.0 joules of work are done in pushing an object with +3.0 coulombs of charge toward a charged plate. What type of charge does the plate have?

• Positive

• Negative

• Neutral

• Impossible to tell, bigfoot took the plate

Multiple Choice

Example 1: 6.0 joules of work are done in pushing an object with +3.0 coulombs of charge toward a charged plate. How much potential energy was stored in the electric field?

• 18 J

• 0.5 J

• 2.0 J

• 6.0 J

Multiple Choice

Example 1: 6.0 joules of work are done in pushing an object with +3.0 coulombs of charge toward a charged plate. How much electrical potential was generated?

• 18 V

• 0.5 V

• 2.0 V

• 6.0 V

Multiple Choice

Example 2: An object with a 2.0 coulomb charge is accelerated through a potential difference of 10 volts.

–How much kinetic energy does the object gain?

• 10 J

• 20 J

• 0.20 J

• 2.0 J

​Electron-volts

​•Alternate unit for work/energy:

•Raises 1e to an electrical potential of 1 V

•1 eV = 1.6 x 10-19 J

​What is the energy needed to raise two electrons to a potential of 1.0 volt?

Multiple Choice

What is the energy needed to raise four electrons to a potential of 2.5 volts?

• 10 eV

• 2.5 eV

• 4.0 eV

• 1.6 eV

Multiple Select

•An electron travels a distance of 2.0 x 10-3 meter as its electrical potential is raised by 300 volts. How much work is done on the electron?

• 0.0033 eV

• 300 eV

• 4.0E-17 J

• 6.25E28 J

Multiple Choice

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?

• 2.7E3 J

• 27 J

• 3.0 J

• 3.0E-2 J

Multiple Choice

Moving 4.0 C of charge through a circuit required 48 J of electric energy. What is the potential difference across this circuit?

• 190 V

• 48 V

• 12 V

• 4.0 V