Q4. Listed below are the results of measurements taken on several different junction diodes. For each diode, the data provided are the diode current ID and the corresponding diode voltage V. In each case, estimate IS, and the diode voltage at 10 ID and ID /10. (a) 10 A, 800 mV (b) 10 μA, 600 mV

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.