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19 Electric Potential and Electric Field

144 Introduction to Electric Potential and Electric Energy

Introduction to Electric Potential and Electric Energy

class=”introduction”
class=”section-summary” title=”Section Summary”class=”conceptual-questions” title=”Conceptual Questions”class=”problems-exercises” title=”Problems & Exercises”

Automated external defibrillator unit (AED) (credit: U.S. Defense Department photo/Tech. Sgt. Suzanne M. Day)

Air Force officials practice using an automated external defibrillator (AED). Electric potential energy is stored in the defibrillator unit and sent to resuscitate the patient.

In Electric Charge and Electric Field, we just scratched the surface (or at least rubbed it) of electrical phenomena. Two of the most familiar aspects of electricity are its energy and voltage. We know, for example, that great amounts of electrical energy can be stored in batteries, are transmitted cross-country through power lines, and may jump from clouds to explode the sap of trees. In a similar manner, at molecular levels, ions cross cell membranes and transfer information. We also know about voltages associated with electricity. Batteries are typically a few volts, the outlets in your home produce 120 volts, and power lines can be as high as hundreds of thousands of volts. But energy and voltage are not the same thing. A motorcycle battery, for example, is small and would not be very successful in replacing the much larger car battery, yet each has the same voltage. In this chapter, we shall examine the relationship between voltage and electrical energy and begin to explore some of the many applications of electricity.

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Introduction to Electric Potential and Electric Energy by OpenStax is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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