Q. 234.1( 16 Votes )

A family uses 8 kW of power. (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW? (b) Compare this area to that of the roof of a typical house.

Answer :

Given,

Power used by the family, P = 8 kW = 8000 W


Solar power incident per square meter, E = 200 W


Efficiency of energy conversion, η = 20%


(a) Let A be the area required to supply 8 kW power.


So, 8×103 = 20% × (A × 200)



A = 200 m2


(b) 200 m2 is equivalent to a rooftop with dimensions 14m×14m.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Inelastic collisions in 1 DInelastic collisions in 1 DInelastic collisions in 1 D44 mins
Check Your progress Part 2| Interactive Quiz: Work, Energy & PowerCheck Your progress Part 2| Interactive Quiz: Work, Energy & PowerCheck Your progress Part 2| Interactive Quiz: Work, Energy & Power44 mins
Work, Energy & Power (Lecture 6)Work, Energy & Power (Lecture 6)Work, Energy & Power (Lecture 6)41 mins
Work, Energy & Power (Lecture 4)Work, Energy & Power (Lecture 4)Work, Energy & Power (Lecture 4)50 mins
Complete Revision of Work , Power and Energy | Mastering important chaptersComplete Revision of Work , Power and Energy | Mastering important chaptersComplete Revision of Work , Power and Energy | Mastering important chapters46 mins
Work, Energy & Power (Lecture 5)Work, Energy & Power (Lecture 5)Work, Energy & Power (Lecture 5)54 mins
Interactive Quiz of Work Power energy | Check your progressInteractive Quiz of Work Power energy | Check your progressInteractive Quiz of Work Power energy | Check your progress53 mins
Conservation of Linear Momentum, Visualize the concept (Theory + Interactive Quiz)Conservation of Linear Momentum, Visualize the concept (Theory + Interactive Quiz)Conservation of Linear Momentum, Visualize the concept (Theory + Interactive Quiz)41 mins
Work, Energy & Power (Lecture 2)Work, Energy & Power (Lecture 2)Work, Energy & Power (Lecture 2)44 mins
Work, Energy & Power (Lecture 3)Work, Energy & Power (Lecture 3)Work, Energy & Power (Lecture 3)47 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :