A p-n junction solar cell has Voc = 0:5 V and Jsc = 20 mA/cm2. A second cell, of the same area, has Voc = 0:7 V and a short circuit current density of Jsc = 12 mA/cm2. You should have no trouble with writing the equation in terms of current or current density as the situation merits. Assuming that both cells obey the ideal diode equation, Eq. 1, find the values of Voc and Jsc when the two are connected in parallel?

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Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?