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... Second, we introduced Ohm’s law that states that, for a wide range of materials, over a wide range of field strengths, the current density is proportional to the electric field that gives rise to it. The constant of proportionality is called the conductivity of the material. We used this constant to ...
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... and at a lead temperature of 25C. If the duty cycle increases, the peak power must be reduced as indicated by the curves of Figure 7. Average power must be derated as the lead or ambient temperature rises above 25C. The average power derating curve normally given on data sheets may be normalized a ...
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... In A. an increasing control voltage (Vc) makes the NPN transistor turn on more. For small voltages at its collector and small base currents, this acts like a variable resistor. This is the variable resistor technique actually used in effects like the Seamoon Funk Machine, EH Dr. Q, and the EH Pulsar ...
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... V3 = I3R3 = (0.25 A)(40 ) = 10 V. This implies that the voltage across R1 and R2 is the remainder of the 13 V provided by the battery. Thus, the voltage across R1 and R2 is 13 V – 10 V = 3 V. (d) The current through R3 is the total current in the circuit, 0.25 A. Since we know the voltage and resis ...
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... "standard application", intended for the use as general electronics equipment. The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportati ...
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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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