Week11-1 - Electric Circuits and Electric Current A flashlight an electric toaster and a cars starting motor all involve electric circuits and

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Electric Circuits and Electric Current A flashlight, an electric toaster, and a car’s starting motor all involve electric circuits and electric current. For the flashlight bulb to light, there must be a closed or complete path from the bulb to both ends of the battery. Such a path is called a circuit .
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Electric Circuits and Electric Current A flashlight, an electric toaster, and a car’s starting motor all involve electric circuits and electric current. In this circuit, the battery is the energy source, using energy from chemical reactions to separate positive and negative charges. This leads to a voltage difference, with an excess of positive charges at one end of the battery and an excess of negative charges at the other. These charges will tend to flow from one terminal to the other if we provide an external conducting path (the circuit ).
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A flow of electric charge is an electric current : where I is electric current, q is charge, and t is time. The standard unit for electric current is the ampere : 1 A = 1 C / s I q t For example, if 3 C of charge flow through a wire in 2 s, then the electric current I is 3 C / 2 s = 1.5 A . Positive charges moving to the right have the same effect as negative charges moving to the left.
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A flow of electric charge is an electric current : where I is electric current, q is charge, and t is time. The standard unit for electric current is the ampere : 1 A = 1 C / s I q t The direction of current is defined as the direction that positive charges would flow. In reality, the charge
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This note was uploaded on 04/23/2011 for the course PHYS 214 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Week11-1 - Electric Circuits and Electric Current A flashlight an electric toaster and a cars starting motor all involve electric circuits and

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