Design a full-wave bridge rectifier to supply 12V DC voltage to a resistive load of RL=3Ω at the output, assuming an AC supply with 60 Hz frequency with the following characteristics: a) Unfiltered (without output capacitor) b) Filtered. Design a filter capacitor so that the ripple factor of the output voltage is less than %5. Regularly if you add a filter capacitor, the average output voltage would increase. You should revise the AC supply peak voltage VVmm calculated in (a) to match the average 12V DC requirement. Find and report the final value of VV�

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.