Physics Electircal Chapter 20 - PHY2049PhysicsII...

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PHY 2049 - Physics II Chapter 20: Electric Circuits Valmín J. Miranda Polytechnic University Puerto Rico Orlando Campus
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Current Our daily life depends on electric circuits. Within a battery, two terminals exist: Positive = less electrons than protons. Negative = more electrons than protons. The maximum potential difference between  terminals is the  electromotive force (emf) . The potential difference between terminals is  less than the maximum.
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Current Example of  ξ  = 12 V in a car battery. The  electric current  is the flow of charge  caused by the electric field. The amount of charge per unit time can be  used to calculate current. Unit for current is an  ampere  (A). t q I =
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Current Direct current (dc)  is produced by the  movement of charges in one direction. Alternating current (ac)  is produced by the  movement of charges changing direction. Although electrons move,  conventional  current  is used to describe circuits. Conventional current assumes the flow of  positive charges, producing the same effect. I  stands for this conventional current.
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Greater battery voltages lead to larger electric  currents. In the simplest case,  I   V . The electrical resistance opposes the flow of  current due to a voltage. The 
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This note was uploaded on 07/20/2011 for the course ELECTRICAL 3800 taught by Professor Lenardomorales during the Spring '11 term at InterAmerican Recinto Metropolitano.

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Physics Electircal Chapter 20 - PHY2049PhysicsII...

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