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Electricity & Optics Physics 24100 Lecture 11 – Chapter 25 sec. 4-5
Electricity & Optics Physics 24100 Lecture 11 – Chapter 25 sec. 4-5

... – Calculate the currents that flow in an electric circuit composed of voltage sources and resistors ...
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Electromotive Force and Potential difference

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Thevenin and Norton equivalents
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... With the current moving counter clockwise because of the direction of the voltage sources. Now in order to calculate the potential difference between B and A, all we have to do is calculate the voltage between these points: VBA = ε1 − I(R1 + R2 ) = 1 − I = 0.515 V ...
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Electrical ballast



An electrical ballast is a device intended to limit the amount of current in an electric circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps, to limit the current through the tube, which would otherwise rise to destructive levels due to the tube's negative resistance characteristic.Ballasts vary in design complexity. They can be as simple as a series resistor or inductor, capacitors, or a combination thereof or as complex as electronic ballasts used with fluorescent lamps and high-intensity discharge lamps.
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