How practical is solar power for various devices? Assume that on a sunny day, su
ID: 1386337 • Letter: H
Question
How practical is solar power for various devices? Assume that on a sunny day, sunlight has an intensity of 1000 W/m2 at the surface of Earth and that, when illuminated by that sunlight, a solar-cell panel can convert 10% of the sunlight's energy into electric power. For each device given below, calculate the area A of solar panel needed to power it.
1-A calculator consumes 50 mW Find A in cm^2
2-A hair dryer consumes 1500
W. Find A in m2.
3-A car requires 20 hp for highway driving at constant velocity (this car would perform poorly in situations requiring acceleration). Find A in m2.
.
Explanation / Answer
Pout = 10% of Pin
50e-3 = 10% of I*A
50e-3 = 0.1*1000*A
A = 5e-4 m^2 = 5 cm^2
++++++++++++++
Pout = 10% of Pin
1500 = 10% of I*A
1500 = 0.1*1000*A
A = 15 m^2
+++++++++++++
Pout = 10% of Pin
20hp = 10% of I*A
20*746 = 0.1*1000*A
A = 149.2 m^2
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.