   # How big a solar cell (in m 2 ) is needed to provide enough power to light a 100-W lightbulb? Assume that solar power is 1.0 × 10 3 W/m 2 and that solar cells are 15% efficient. ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

#### Solutions

Chapter
Section ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 10, Problem 37E
Textbook Problem
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## How big a solar cell (in m 2 ) is needed to provide enough power to light a 100-W lightbulb? Assume that solar power is 1.0 × 10 3  W/m 2 and that solar cells are 15% efficient.

Interpretation Introduction

Interpretation:

The surface area of the solar cell required to light a bulb is to be calculated.

Concept Introduction:

Power input on the solar cells is the total active area of the solar cells multiplied by solar power. The percent of the input power that is converted to output power by a solar cell is called its efficiency. Percent efficiency of a solar cell is 100 multiplied by the ratio of the power out and the power in.

Percent efficiency=Power outPower in×100 …… (1)

Power input=Surface area × Average solar power

### Explanation of Solution

Given information:

The power output requirement is 100 W.

The average solar power is 1.0 × 103W/m2.

Efficiency of the solar cells is 15 %.

The area of the solar cells is considered to be, A m2.

Power input on the solar cell is calculated as follows:

Powerinput=(A m2

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