lesson #27

Lesson #27
E.Q: What is the importance of electric potential energy in our daily lives?

Electric Potential Difference

Electrical Circuits

The flow of charge through wires allows us to cook our food, light our homes, air-condition our work and living space, entertain us with movies and music and even allows us to drive to work or school safely

What is an Electric Field?

• The influnce of charge objects to move about in space.

  
  

• Vectors are arrows that describe the electric field

Electric Field Lines/Vectors

• Vectors/Arrows move away from the Positive Charges

• Vectors Always move toward the Negative Charges

Multiple Choice

What is meant by electric field vector?

• a vector quantity that exists at every point in space.

• the direction a negative charge will move in an electric field

• the space of the electric field

• the influence of the electric fiels

Electric fields are similar to gravitational fields

Both involve action-at-a-distance forces.

Multiple Choice

Potential Energy increases as it moves further from the source.

• Tue

• False

Multiple Choice

Potential energy increases as it moves further from the Neg (-).

• true

• false

Objects naturally move from high potential energy to low potential energy under the influence of the field force

• Work is required to move an object from low energy to high energy.

• To move a charge in an electric field against its natural direction of motion would require work

The movement of charge

• moves with the electric field

• High to Low

• Diagram A requires work to go from A-B

• Diagram B No work is required to go from B-A

Multiple Choice

Look at the image provided. Why does diagram B require work?

• the charge moves from low potential to high potential

• The charge moves from high potential to low potential

• the charge is unstable and requires energy to stabilize

• the electric field is in the opposite direction as the charge

Electric Potential in Circuits

• A battery powered electric circuit has locations of high and low potential

• An electric field established between the two terminals

• The charge would lose potential energy as moves through the external circuit from the positive terminal to the negative terminal

• 
  

Multiple Choice

The quantity electric potential is defined as the amount of _____.

• electric potential energy

• force acting upon a charge

• potential energy per charge

• force per charge

Fill in the Blank

When work is done on a positive test charge by an external force to move it from one location to another, potential energy _________

As a positive test charge moves through the external circuit

• Each circuit element serves as an energy-transforming device

• Light bulbs, motors, and heating elements

Upon leaving the circuit element, the charge is less energized

• Location A high electric potential location

• Location C just after leaving the light bulb is a low electric potential location

• The loss in electric potential while passing through a circuit element is often referred to as a voltage drop

Fill in the Blank

Use >, <, and = signs to compare the electric potential (V) at the four points of the circuit.

VA VB VC VD

Electric Potential Difference

• the amount of potential energy per unit of charge at a specified location

• there is also a difference in electric potential between locations A and B

• This difference in electric potential is represented by the symbol ΔV

• One Volt is equivalent to one Joule per Coulomb

• V=J/C or C=V/J or J=C*V

• 
  

Multiple Choice

A 12 volt battery move a ___ C of charge from the - to the + terminal and spent 18 J of work toof .

• 12C

• 15C

• 1.5C

• 324C

Multiple Choice

Where in the diagram of the external circuit is the Potential the lowest?

• Between A-B

• Between B-C

• Between C-D

• Between E-F

Multiple Choice

Where in the diagram of the external circuit is the Potential the greatest?

• Between A-B

• Between B-C

• Between C-D

• Between E-F