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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.
A new interstate highway is being built with a design speed of 70 mi/h. For one of the horizontal curves, the radius (measured to the innermost vehicle path) is tentatively planned as 2500 ft. What rate of super elevation is required for this curv..
Will biometric authentication methods be useful in the future? What kind of attacks could be mounted in practice?
The supersonic nozzle of Fig is over expanded (case G of Fig) with Ae/At = 3.0 and a stagnation pressure of 350 kPa. If the jet edge makes a 4° angle with the nozzle centerline, what is the back pressure pr in kPa?
Discuss the value of risk analysis and how the process can be used to derive project management decisions under conditions of uncertainty
Find the capacitance-to-neutral and capacitive reactance-to-neutral for each 1-mile length of line - total three-phase reactive power supplied by the line capacitance.
Identify 3 to 5 technology or telecom standards organizations and the role they play in the industry. Choose one organization to look into in more depth
1) What is the minimum gauge pressure needed in the water pipe leading to a building if water is to come out of a faucet on the 12th floor, 41 m. above the pipe?
You have a length of steel of about 20 × 20 mm section that must be used to urgently replace a broken member. What tests can you perform to ensure that the steel will be adequate?
1. The impedance of a capacitor is inversely proportional to the frequency and the capacitor effectively blocks dc voltage.
Business law impacts our everyday lives, both personally and professionally. Businesses enter contracts, manufacture goods, s ell services and products, and engage in employment and labor practices - activities that must all adhere to certain laws..
Summarize the sensory pathways to the brain for gustatory and olfactory sensations.Analyze and describe the process of hearing from the external to inner ear.Analyze and describe how the ear provides equilibrium and balance for the body.
A 1.5-V, 1-Gbit dynamic RAM (called DRAM) by Hitachi uses a 0.16-μm process with a cell size of 0.38× 0.76 μm2 in a 19×38 mm2 chip. What fraction of the chip is occupied by the I/O connections, peripheral circuits, and interconnect?
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