33. A reasonable value to assume for the efficiency oft a common single solar ce

Question

33. A reasonable value to assume for the efficiency oft a common single solar cell is, a- b, c, d, e, 90) to 95% 7010 80% 50 to 60% 30 to 35% 15to20% 34. The purpose of the PN junction in a solar cell is? a. To direct the direction of free electron flow b. To generate free electrons c. To generate free holes d. To isolate the P and N material e. To connect the P and N materials 35. For the following system of solar cells, what is the power produced by the cells if the voltage from both cells is 3 Volts (i,e, VI V2-3 Volts) and the motor current is 2 Amp? a 9W b. 12W c. 18W d. 24W e. 48. W motor 36. A construction crane motor can put out 10 kW of power. Which of the following values is closest to the time that it takes for this crane to lift a 1000-kg steel beam from ground level to 20 meters above the ground? a. 10 seconds b. 13 seconds c. 15 seconds d. 19 seconds e. 30 seconds

Explanation / Answer

33. Solar cell gives efficiency between 15 to 20 %

34. The purpose of pn junction is that it connects p and n regions thereby generation nad recombination of electron hole pair become possible.

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