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Dear Mr Poon, (monarchy@earlink.net) 1/27/2015
Dear Mr Poon, ([email protected]) 1/27/2015

... Most  any  bi-­‐polar  transistor  may  be  used,  but  the  zener  voltage  will  vary  from  about  3  to  10  volts  depending  on  the  parDcular  transistor  used.    Time  delay  is  roughly  16  seconds  using  a  22K  res ...
Application of electric field to currents in conductors. pp
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Introduction - inst.eecs.berkeley.edu

... The details of configuring the meter to measure current, voltage and resistance will be covered by the TA in lab. The concept behind the measurement of current and voltage will be discussed here. It will be helpful to discuss this concept by drawing an analogy to mechanical engineering: you can thin ...
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... Answer: zero! This is a tricky one! Initially, there is no charge q on the capacitor so no VC = q/C. Prior to opening the switch, the capacitor is discharged, because the inductor acts like a short (a wire) which discharges the capacitor. When the switch is opened, current begins flowing through th ...
BITX40 with Raduino - tips and mods
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Optically Isolated Triac Driver

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... • Current through each device is the same (since single pathway for charge) • Total resistance of circuit = sum of resistances of devices • Current = (voltage of source)/(Total resistance), from Ohm’s law • Voltage drop across each device is proportional to its resistance. This is also from Ohm’s la ...
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... Note that because the upper terminal for the voltage vW is inside the equivalent circuit, and not present outside the equivalent circuit, it is not possible to label vW on the diagram after replacing the equivalent circuit with the 3.49[kW] resistor. Note, however, that since the voltage vX can be l ...
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... shift  between half-bridge output voltages va and vb . The load is an R-L load with R = 10  and L = 10 mH . (a) For  = 2 / 3 sketch vo and find its total harmonic dostortion THD . (b) For  = 2 / 3 find approximately the rms value of the load current i0 by considering harmonics with order n  7 ...
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... • Bypass supply voltage tolerance: +/- 10% (adjustable) • Bypass supply frequency tolerance: +/- 5% (adjustable) • Output filter provides mains filtering and power factor correction from 0.8 to 0.9 (dep. on load) ...
emf and the terminal voltage
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... • The battery is not a constant source of current because of internal losses within the battery • The chemical reaction that produces the electrical energy also produces heat, and may be modeled as a resistor internal to the battery. This is called the internal resistance “r”. ...
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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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