LEDs and CFLs: Energy-Efficient Lighting

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Questions and Answers

What percentage of electrical energy consumed by incandescent lamps is converted into light?

50 to 60%

30 to 40%

20 to 30%

10 to 12% (correct)

What is the primary advantage of fluorescent lamps over incandescent lamps?

Fluorescent lamps require more energy to operate.

Fluorescent lamps have a higher light output efficiency. (correct)

Fluorescent lamps produce more heat.

Fluorescent lamps are generally less durable.

How do fluorescent lamps generate light?

By passing electricity through a glass vacuum.

By using solar energy collected in the bulb.

By ionizing mercury vapor and exciting phosphor coatings. (correct)

By heating a tungsten filament.

What role does the ballast play in a fluorescent lamp?

It produces the initial high voltage for gas ionization. Signup and view all the answers

Which of the following is a main goal of green buildings?

Enhancing occupant health and resource efficiency. Signup and view all the answers

What type of light do fluorescent lamps primarily produce in the process of generating visible light?

Ultraviolet light. Signup and view all the answers

What is a common characteristic of incandescent lamps in terms of energy waste?

They waste more energy as heat than they convert into light. Signup and view all the answers

How much less power does a CFL consume compared to an incandescent lamp for the same light output?

Two-thirds less. Signup and view all the answers

What is one of the key features of a Green Building regarding energy generation?

Integration of renewable energy sources to generate energy on-site Signup and view all the answers

How much less electricity do green buildings consume compared to conventional buildings?

40% ~ 60% Signup and view all the answers

Which of the following is NOT considered a tangible benefit of Green Buildings?

Enhanced air quality Signup and view all the answers

What does wastewater generally include?

Used water from sinks, showers, and toilets Signup and view all the answers

Which of the following statements about water use in green buildings is true?

They consume 40% ~ 80% less water due to efficient systems. Signup and view all the answers

What is a prominent feature of effective waste management in green buildings?

Employing strategies to reduce waste on-site Signup and view all the answers

Which of the following elements contributes to indoor environmental quality in green buildings?

Maintaining indoor thermal and visual comfort Signup and view all the answers

What is a common misconception about storm runoff?

It is always clean rainwater. Signup and view all the answers

What is the primary reason Light Emitting Diodes (LEDs) are considered more efficient than conventional light sources?

They convert electrical energy directly into light. Signup and view all the answers

Which of the following is NOT an application of Light Emitting Diodes (LEDs)?

Incandescent bulbs Signup and view all the answers

What constitutes the major components of a compact fluorescent lamp (CFL)?

A bent glass tube and a ballast Signup and view all the answers

How does a CFL save energy compared to traditional incandescent bulbs?

It has lower energy consumption. Signup and view all the answers

What is the main disadvantage of using Compact Fluorescent Lamps (CFLs)?

They emit ultraviolet light. Signup and view all the answers

What is the primary concern addressed by keeping water clean?

Preventing disease transmission Signup and view all the answers

What happens during the process when an LED emits light?

Holes and electrons recombine at the P-N junction. Signup and view all the answers

What type of energy transformation is involved in generating electricity from biogas?

Chemical energy to mechanical energy Signup and view all the answers

Which of these statements correctly describes the operating principle of a CFL?

It uses gas and phosphor to produce light. Signup and view all the answers

Which best describes the role of the AC generator in a biogas plant?

Transforms mechanical energy into electrical energy Signup and view all the answers

What characteristic of LEDs makes them favorable for traffic lights?

They emit light in a specific color range. Signup and view all the answers

What is a critical habitat component for aquatic wildlife?

Rivers and ocean waters Signup and view all the answers

What is the main component of biogas?

Methane Signup and view all the answers

How does a solar cell convert energy?

From light energy to electrical energy Signup and view all the answers

Which step is involved in the process after producing electricity from biogas?

Transmitting power through a transformer Signup and view all the answers

Why is clean water vital for wildlife habitats?

It removes disease-causing agents. Signup and view all the answers

What can happen if wastewater is not treated properly?

Harm to fish and wildlife populations Signup and view all the answers

Which pollutant is specifically mentioned as causing oxygen depletion in aquatic environments?

Decaying organic matter Signup and view all the answers

What is a potential result of nutrient overload in water bodies?

Eutrophication Signup and view all the answers

Which of the following metals is identified as having potential toxic effects in wastewater?

Mercury Signup and view all the answers

What is the primary goal of wastewater treatment?

To remove as much suspended solid material as possible Signup and view all the answers

What percentage of suspended solids is typically removed during primary wastewater treatment?

Approximately 60% Signup and view all the answers

Which pollutant is noted for causing restrictions on beach and shellfish consumption?

Bacteria and viruses Signup and view all the answers

What does secondary treatment effectively do to suspended solids?

Removes more than 90% Signup and view all the answers

Study Notes

Light Emitting Diode (LED)

Light Emitting Diodes (LEDs) are semiconductor diodes that emit either visible or invisible infrared light when forward biased.
LEDs combining P-type and N-type semiconductors convert electrical energy directly into light, making them more efficient than conventional light sources.
Infrared LEDs are used in remote controls.

Compact Fluorescent Lamps (CFLs)

CFLs are compact versions of fluorescent lamps, providing energy-efficient light generation.
CFLs use a sealed tube with a phosphor coating and mercury vapor to produce ultraviolet (UV) light, which then excites the phosphor to emit visible light.
CFLs convert a significantly higher percentage of electrical energy into light compared to incandescent lamps, leading to energy savings and reduced heat generation.

Green Building

Green buildings are designed, built, and operated in an environmentally sustainable manner.
They prioritize occupant health, energy and water efficiency, and the use of renewable energy sources.
Salient features include building envelope design, energy-efficient systems, water recycling, and the use of eco-friendly materials.

Benefits of Green Buildings

Green buildings consume significantly less energy and water compared to conventional buildings.
They generate less waste due to on-site waste management strategies.
Intangible benefits include improved air quality, natural light, occupant health, and a positive impact on the environment.

Waste Water Management

Wastewater treatment is essential to protect the environment and human health by removing pollutants from used water.
Wastewater treatment facilities use various methods to remove suspended solids and pollutants, aiming to discharge treated water back to the environment safely.
Untreated wastewater can harm ecosystems, contaminate drinking water, and affect human health.

Biogas Plant

Biogas is a renewable energy source derived from the decomposition of organic materials like manure and plant remains.
Biogas plants use a digester to break down organic matter and generate biogas, primarily methane.
Biogas is used as a fuel and to produce electricity, offering a sustainable energy alternative.

Solar Cell

Solar cells are devices that convert light energy directly into electrical energy.
Semiconductors are commonly used in solar cell material for the conversion process.

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Description

Explore the differences and efficiencies of Light Emitting Diodes (LEDs) and Compact Fluorescent Lamps (CFLs) in this quiz. Learn how these lighting technologies convert energy into light and their roles in green building practices. Test your knowledge on the benefits and applications of each type of lighting.