ENGR 10 FINAL EXAM/ 99 Q&A/ / Terms like:
A student weighs 140 lb. This student is able to run up to the 3rd floor in 20 seconds. The 3rd floor is 10 meters above the ground floor. Which of the following values is closest to the average power this student exerted in climbing the stairs? - Answe...
A student weighs 140 lb. This student is able to run up to the 3rd floor in 20
seconds. The 3rd floor is 10 meters above the ground floor. Which of the following
values is closest to the average power this student exerted in climbing the stairs? -
Answer: 310 W
A current of 2 Amps is flowing through a 3Ω resistor. How much power is
dissipated by the resistor? - Answer: 12 W
A reasonable value to assume for the efficiency of a common solar cell that is used
in typical PV installations on homes and businesses is - Answer: 0.15 to 0.25
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,When you combine P-type and N-type silicon in a solar cell, what happens? -
Answer: Electrons at the N-P junction eventually form a barrier in the form of an
electric field.
(This barrier is an electric field)
Power from the sun on earth at noon on a sunny day is about 1040 W/m2.
For a 2 m by 2 m solar panel, with an efficiency of 12%, the output power is about
- Answer: 500 W
Two solar panels are shown below. The one on the left has dimensions L meters
by L meters. The one on the right has dimensions 1.5L meters by 1.5L meters.
They are both made by the same manufacturer and have the same efficiency.
When subjected to the same sun intensity, what is the ratio of the power output
on the right (PR) to the power output on the left (PL)? - Answer: (PR)/(PL) = 2.3
What technology do solar cells use to turn light into energy - Answer:
semiconductors
Which of the following factors affect the performance of a solar cell? Choose as
many answers as you think are correct.
The intensity of the light
The surface condition of solar cells (cleanness)
The wavelength of the light
The angle of incident light - Answer: The intensity of the light
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, The surface condition of solar cells (cleanness)
The wavelength of the light
The angle of incident light
Which of the following statements is false? (Hint:review lecture notes)
The solar cell's output current varies with load
The solar cell's voltage varies with output current.
The solar cell's voltage varies with output power.
The solar cell's maximum output power is its maximum output voltage times its
maximum output current.
Pmax = Vmax x I max - Answer: The solar cell's maximum output power is its
maximum output voltage times its maximum output current.
Pmax = Vmax x I max
What are the units of voltage, current, and power you will read from the power
meter as you take measurements in the solar cell experiment?Hint: look in the
solar cell lab guidelines APPENDIX found on the ENGR 10 web site. - Answer: V,
mA, W
According to the solar lab guidelines posted on the ENGR 10 web site, the RED
leads in the photo are attached to the negative output of the solar cells.
(Hint: look at the solar guidelines on the ENGR 10 web site) - Answer: False
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