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# Conceptual Physics - PowerPoint PPT Presentation

Conceptual Physics. Notes on Chapter 33 Electric Fields & Potential. Electric Fields & Potential. “ May the FORCE be with you ”. Electric Fields & Potential. All particles have an electric field around them. A electric field is a kind of aura that extends outward through space.

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### Conceptual Physics

Notes on Chapter 33

Electric Fields & Potential

“May the FORCE be with you”

• All particles have an electric field around them.

A electric field is a kind of aura that extends outward through space.

• To show the effects of the electric field, we use a “small test charge” (which is positive) to determine the direction and strength of the field.

• To show the effects of the electric field, we use a “small test charge” (which is positive) to determine the direction and strength of the field.

• Since the field has magnitude and direction it is

a vector and can

be represented

with vectors.

• These vectors are called Field lines or Lines of force

• (See fig. 33.3 pg. 519)

• Where these force lines are close together, the force is strong. Where the lines are farther apart, the force is weaker.

Electric Shielding:

• Because of mutual repulsion, electrons move as far apart as possible. On a hollow object, the interior will have NO CHARGE OR FIELD. The force on a test charge inside a hollow sphere will cancel to Zero

• On odd shaped objects, the chargeinside is still zero, but not uniform on the outside.

Electric Potential Energy:

• Remember chapter 8 when you lifted an object --- you did work on that object. The same thing applies here.

• A test charge has

Potential Energy by

virtue of its position.

• If the test charge is “let go”, the potential energy will be transferred into kinetic energy of movement.

Electric Potential = Electric potential energy

Charge

1 Volt = 1 Joule_____

1 Coulomb

• Note --- The voltage of a balloon rubbed on your head can be very high. But the electric potential energy is low because of the small amount of charge.

Storage of Energy:

• Electrical energy can be stored in a common device called a capacitor.

• A capacitor is a devise that has two plates separated by a small distance and connected to a battery.

• Note --- this can be a Shocking experience if you are the discharging path !