ch18_ecls


 * Chapter 18 **
 * Section 1 (Electrical Potenial Energy) **
 * Vocab **
 * Uniform electric field:** an electric field that has all of the field lines parallel to and equidestant from each other
 * Electrical potential energy**- can be solved for by taking the product of the force generated by the field and its position in the field.

math PE_{electric}= -qEd math

E= a uniform electric field d= displacement

Can use the initial and final positions of the displacement can be found using this:

math \Delta PE_{electric}= -qE \Delta d math

Fun Fact: A uniform electric field will always exert a constant force on a charged object.
 * Section 2 (Potential Difference) **
 * Vocab **
 * Electric potential(V):** the electrical potential energy per unit charge

math potential difference(\Delta V): math

relative difference in electric potential between two points. Measured in volts (V). V= -Ed

math \Delta V= -E \Delta d math

Fun Fact: the electric potential at a given point is INDEPENDENT of the charge at that point


 * Section 3 (Capacitance): **


 * Vocab: **
 * capacitor:** a device that is used in a variety of electric circuits to perform many functions
 * parallel-plate capacitor:** this design consists of two parallel metal plates separated by a small distance
 * capacitance:** the measurement of the ability of a conductor to store energy in the form of electrically separated charges

math capacitance= \frac {Q} {\Delta V} math

The SI unit for capacitance is the farad (F)

math capacitance= math

(Section 1) 1. Two alpha particles each consisting of two protons and two neutrons have an electrical potential energy of 6.32 x 10 -19 J. What is the distance between these particles at this time?
 * Fun review problems that you SHOULD TRY: **

(Section 2) 1. Two point charges of magnitude 5.0 nC and -3.0 nC are separated by 35.0 cm. What is the potential difference between a point infinity far away and a point midway between the crazy awesome charges. 2. The gap between electrodes in a spark plug in Mr. Strong's toiletry closet is 0.060 cm. To produce an electric spark in a gasoline air mixture in Mr. Strong's hair dryer, there must be an electric field of 3.0 x 10 6 V/m. What minimum potential difference must be supplied by the ignition circuit to start Mr. Strong's gasoline-powered hairdryer?

(Section 3) 1. A parallel-plate capacitor has a capacitance of 1.3 pF. If a 12.0 V battery is connected to this capacitor, how much electrical potential energy would it store? 2. We demand you to make a parallel-plate capacitor having a capacitance of 1.00 F and a plate separation of 1.00 mm. Calculate the required surface area of each plate.

Faughn, Jerry S., and Raymond A. Serway. __Holt Physics__. Austin: Harcourt Classroom Education Company, 2002.