Current, Resistance, and Electromotive Force



This chapters we studied the interactions of electrification charges at ‘re ready to study charges in motion. An electric current in motion from one region to another. When this within a conducting path that forms a closed loop, the  is circuit. circuits are a means for conveying energy to another. As charged particles move within a circuit, energy is transferred from a source (such as a battery or to a device in which that energy is either stored or converted to form: into sound in a stereo system or into heat and light in a bulb. From a technological stand point, electric circuits are they allow energy to be transported without any moving than the moving charged particles themselves). Electric the heart of flashlights, CD players, computers, radio and and receivers, and household and industrial power .

The nervous systems of animals and humans are specialized electric circuits that carry vital signals from one part of the  to another.In this chapter we will study the basic properties of electric currents.  To understand the behavior of currents in electric circuits, we’ll describe the properties of conductors and how they depend on temperature. We’ll  learn why a short, fat, cold copper wire is a better conductor than a long,skinny, hot steel wire. We’ll study the properties of batteries and how they  cause current and energy transfer in a circuit. In this analysis we will use the concepts of current, potential difference (or voltage), resistance, and electromotive force. Finally, we’ll look at electric current in a material from a microscopic viewpoint.

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