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1. An AC dimmer shown in Figure 1 is used to adjust brightness of incandescent bulb by varying the value of resistor Rs. Derive an equation for the power consumed in bulb as a function of adjustable resistance Rs. Plot variation of lamp power in percent of full power as a function of Rs from 4 k? to 570 k? (minimum step size is 500 ?). Supply voltage is 220 V, 50 Hz AC sinusoidal voltage. Lamp rated power is 500 W, Cs = 0.1 µF and break over voltage of diac is ±32 V. Please note that derivation is required - direct copying of formulas from some other sources are not allowed. Show all calculations to get full credit and include any computer program listings that you use.
Q2. Two 1.2V, 2100mAh NiMh (Nickel Metal Hydride) batteries (model number: Panasonic BK210A) are connected in series to supply a DC voltage of 5V and a DC current of 1A to a portable charger for your cellular phone. In order to achieve small footprint (small size and low weight), the switching frequency must be 100 kHz. The inductor current ripple and output voltage ripple is 10% and 1% of their averaged values, respectively. Draw the complete circuit schematic that will achieve this conversion and determine the values of all circuit elements. What are the average values of input current, input power, and output power? Determine the total operational time in minutes and total energy in Joules delivered to load for a fully charged battery considering the discharge curve of batteries given in the manufacturer datasheets and using end of termination voltage of 1.0V. Assume ideal semiconductor devices and steady-state operation.
There upon, we can switch each load on or off without affecting the power delivered to the other loads. How would we connect the loads and switches if the source is an ideal independent current source?
The most common sampling method is the convenience sample, therefore, many of the studies that you find for evidence use this sampling method. What are the implications for using a convenience sample on the way you interpret and use the findings?
Create a tire pressure - tire spring coefficient curve. Use your spare or bicycle tire - Experimentally determine the spring constant of your car and the damping coefficient
It is required to design the sense amplifier of Fig. 16.24 to detect an input signal of 140 mV and provide a full output in 0.5 ns. If C = 50 fF and VDD = 1.2 V, find the required current I and the power dissipation.
What is the phase margin obtained? To increase the phase margin, a resistance R is connected in series with CC. What is the value of R that results in Fz =∞, and what is the resulting phase margin?
block diagram system performance and responses1. simplify the above block diagram and determine the closed diagram
Describe your chosen architecture pattern. Explain why you selected the architecture of this case study. Explain how your chosen pattern could be applied to this case study.
A direct current of 0.125 ampere was passed through 200 milliliters of a 0.25 molar solution of Fe2(SO4)3 between platinum electrodes for a period of 1.100 hours. Oxygen gas was produced at the anode. The only change at the cathode was a slight chang..
Determine the airflows in each branch and what are the flows and pressure drops in each of the branches? Remove the restrictions from the previous question.
What is the minimum concrete cover for the reinforcing steel and what is the minimum dimension of the column?
Determine the complex power in per unit transmitted to the load through each transformer. Comment on how the transformers share the real and reactive powers.
Define the data and control context diagrams of the alarm control firmware and define data flow diagram DFD 0 which shows at least four different processes, and its corresponding control flow diagram CFD 0.
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