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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.
An E1 is the European version of our T1. An E1 frame has 32 channels. The first channel is channel 0. All 8 bits of channel 0 are used for framing. Channels 1 to 15 are used for data or voice and no bit robbing is used or needed.
In many circuits, different frequencies are present which are encountered during the operation. Some frequencies are desired while some others are not. The non desired frequencies can be rejected with special circuits called filters. Filters can b..
The scenarios are these: You have been asked to help your best friend plan a wedding or a family reunion in another city. You have no concern for schedule or budget at the moment, only defining the work that needs to be done for the wedding or r..
Choose a control system that has direct impact on your daily life. Explain how this control system affects your life. Is it analog, digital or both? Identify the main elements in the control system. For instance, what is the sensor, what is the ac..
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.
Find the pressure increase in the fluid in a syringe when a nurse applies a force of 42 N to the syringe's circular piston, which has a radius of 1.1 cm.
a power plant is analyzed as a simple ideal rankine cycle with a boiler operating at 300 oc. steam leaves the boiler
Associated with each stage is a parasitic input capacitance (to ground) of 10 pF and a arasitic output capacitance (to ground) of 2 pF. Parasitic capacitances of 10 pF and 7 pF also are associated with the signal-source and load connections, respe..
What is the mechanical advantage of a 1/4-20 UNC x 2" bolt?
What is a flexible ac transmission systems (FACTS) device? One example of a FACTS device is a static synchronous compensator and what is a phasor measurement unit (PMU) in electric power systems?
CEE 357 Win 2014 HW#2: What will the maximum concentration of pesticide be in the pond, and how long after the spill will that concentration occur?
Determine and plot the equilibrium drawdown curve on a line through the well and perpendicular to the barrier.
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