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Category 2 (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Team A Team B Category 1 (3p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Category 3 (1p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9

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Team A. Team B. Category 1 (3p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10. Category 2 (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10. - PowerPoint PPT Presentation

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Page 1: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Category 2 (2p)

Question 1Question 2Question 3Question 4Question 5Question 6Question 7Question 8Question 9

Question 10

Team A

Team B

Category 1 (3p)

Question 1Question 2Question 3Question 4Question 5Question 6Question 7Question 8Question 9

Question 10

Category 3 (1p)

Question 1Question 2Question 3Question 4Question 5Question 6Question 7Question 8Question 9

Question 10

Page 2: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q1) THE HISTORY OF SOLAR ENERGY

Energy from the sun has been used by people for centuries. As early as the

7th century B.C., ancient people used simple magnifying glasses to

concentrate the light of the sun into beams so hot they would cause wood

to catch fire. The Greeks and Romans use magnifying glasses to burn the

sails of enemy ships. It was first applied to use in 212 B.C., by the Greek

scientist Archimedes. Solar energy was used to defend the harbor of

Syracuse (Sicily) against the Roman fleet. Archimedes used a mirror or

"burning mirror" as they had called it, to set fire to Rome's wooden ships

while standing on shore.

Page 3: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 1 (3 points) When was solar energy used to defend the

harbor of Sicily against the Roman fleet?

A. in 240 BC

B. in 220 BC

C. in 212 BC

D. In 222 BC

Page 4: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q2) TYPES OF SOLAR TECHNOLOGY

• Solar energy, radiant light and heat from the sun, has been

harnessed by humans since ancient times using a range of ever-

evolving technologies. Solar energy technologies include solar heating,

solar photovoltaics, solar thermal electricity and solar architecture,

which can make considerable contributions to solving some of the

most urgent problems the world now faces.

• Solar technologies are broadly characterized as either passive solar or

active solar depending on the way they capture, convert and distribute

solar energy. Active solar techniques include the use of photovoltaic

panels and solar thermal collectors to harness the energy. Passive

solar techniques include orienting a building to the Sun, selecting

materials with favorable thermal mass or light dispersing properties,

and designing spaces that naturally circulate air.

Page 5: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 2 (3 points)

Photovoltaic panels are characterized as:

A. active solar technologies

B. passive solar technologies

C. both a and b depending on the materials

D. neither a nor b

Page 6: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q3) USE OF THERMAL MASS MATERIALS

Thermal mass is any material that can be used to

store heat— heat from the Sun in the case of solar

energy. Common thermal mass materials include

stone, cement and water. Historically they have

been used in arid climates or warm temperate

regions to keep buildings cool by absorbing solar

energy during the day and radiating stored heat to

the cooler atmosphere at night. However they can

be used in cold temperate areas to maintain warmth

as well.

Page 7: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 3 (3 points) Which of the following is not a

thermal mass material?

A. stone

B. water

C. cement

D. wind

Page 8: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q4) SIZE AND PLACEMENT OF THERMAL MASS

The size and placement of thermal mass

depend on several factors such as climate,

daylighting and shading conditions. When

properly incorporated, thermal mass

maintains space temperatures in a

comfortable range and reduces the need for

auxiliary heating and cooling equipment.

Page 9: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 4 (3 points) The size and placement of thermal

mass do not depend on:

A. day lighting

B. climate

C. standard electricity meters

D. shading conditions

Page 10: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

A solar panel is a packaged, connected assembly of

photovoltaic cells. The solar panel can be used as a

component of a larger photovoltaic system to generate

and supply electricity in commercial and residential

applications. Each panel is rated by its DC output power

under standard test conditions, and typically ranges

from 100 to 320 watts.

(Q5) The solar panel

Page 11: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 5 (3 points)

The DC output power of a typical solar panel ranges from:

A. 100 to 230 watts

B. 100 to 300 watts

C. 100 to 320 watts

D. 100 to 350 watts

Page 12: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

A photovoltaic system typically includes an array

of solar panels, an inverter, and sometimes a

battery and or solar tracker and interconnection

wiring.

(Q6) A PHOTOVOLTAIC SYSTEM

Page 13: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 6 (3 points)

A photovoltaic system may include:

A. a battery

B. a solar tracker

C. interconnection wiring

D. all of the above

Page 14: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

• Single crystal modules have been around the longest and are the most effective. They are the most efficient (10-17%)

• Poly/Multicrystalline modules are second in line. They are cheaper than single crystal, but run at 9-14% efficiency.

• String ribbon modules are fairly cheap and are 7-8% efficient.

• Thin Film (Amorphous) modules are a thin layer of silicon deposited on top of steel or glass. They are cheap to make, but their efficiency is very low (5-7%).

(Q7) Types of Solar Panels

Page 15: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 7 (3 points) The most efficient kind of solar

panel up to now is:

A. Thin film (amorphous modules)

B. Single crystal modules

C. Poly/Multicrystalline modules

D. None of the above

Page 16: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Phaethon, a young man, travels to the Palace of the Sun to meet Apollo and find out if the sun god is in fact his father. Apollo says he is. To prove it, he will give Phaethon anything he wants, swearing by the River Styx that he will grant Phaethon his wildest dream. The boy's dream is to ride Apollo's chariot. Although his father warns him that no god (let alone a human) can control the horses and safely ride the chariot across the sky, Phaethon will not listen. Apollo seems to have no choice but to let his son drive the chariot and watch as the horses run recklessly through the sky, crashing into stars and even setting the earth on fire. To prevent the entire planet from burning, Zeus sends a thunderbolt which kills Phaethon and drives the horses into the sea.

(Q8) Myths about the sun

Page 17: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 8 (3 points) The land which caught fire when

Phaethon lost control of the chariot could be:

A. Africa

B. Asia

C. Europe

D. America

Page 18: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q9) Solar power

Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP). Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. Photovoltaics convert light into electric current using the photoelectric effect. The efficiency of a photovoltaic installation varies by geographic region because the average insolation depends on the average cloudiness and the thickness of atmosphere traversed by the sunlight. It also depends on the path of the sun relative to the panel and the horizon.Panels can be mounted at an angle based on latitude, or solar tracking can be utilized to access even more perpendicular sunlight, thereby raising the total energy output.

Page 19: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 9 (3 points) The conversion of sunlight into

electricity is known as:

A. solar energy

B. solar power

C. photoelectric effect

D. none of the above

Page 20: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q10) HOW DO SOLAR CELLS WORK?

Solar (or photovoltaic) cells convert the sun’s energy into electricity. They rely on the photoelectric effect: the ability of matter to emit electrons when a light is shone on it.Silicon is what is known as a semi-conductor, meaning that it shares some of the properties of metals and some of those of an electrical insulator, making it a key ingredient in solar cells. Sunlight is composed of miniscule particles called photons, which radiate from the sun. As these hit the silicon atoms of the solar cell, they transfer their energy to loose electrons, knocking them clean off the atoms. The photons could be compared to the white ball in a game of pool, which passes on its energy to the colored balls it strikes.

Page 21: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q10) HOW DO SOLAR CELLS WORK?

Freeing up electrons is however

only half the work of a solar cell:

it then needs to herd these stray

electrons into an electric current.

This involves creating an

electrical imbalance within the

cell, which acts a bit like a slope

down which the electrons will

flow in the same direction.

Creating this imbalance is made

possible by the internal

organization of silicon.

Page 22: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 10 (3 points) When light hits .........., energy

turns into an electric current:

A. photons

B. electrons

C. silicon

D. metals or insulators

Page 23: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7
Page 24: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q1) Different ways to harness the sun's energy

There are three different ways to harness the sun's energy:

•passive solar,

•active solar

•and photovoltaic systems.

Passive solar is the capturing and storing the suns' energy -

light and heat - without the use of any mechanical devices. As the

solar radiation strikes floors, walls, and other objects within the

room it is converted to heat. A good example of a passive solar

energy system is a greenhouse.

Page 25: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 1 (2 points)Passive solar-powered homes

have:

A. photovoltaic cells that convert sunlight into electricity

B. sun-capture systems which power generators

C. windows that allow the sun's heat to enter and warm the house

Page 26: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q2) Different ways to harness the sun's energy

There are three different ways to harness the sun's energy:

•passive solar,

•active solar

•and photovoltaic systems.

Active solar uses devices to collect, store, and circulate heat

produced from solar energy. Active solar energy technologies

convert sunlight into heat by using a particular energy transfer

fluid. This is most often water or air but can also be a variety of

other substances.

Page 27: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 2 (2 points)Active solar-powered homes have:

A. photovoltaic cells that convert sunlight into electricity

B. sun-capture systems which power generators

C. windows that allow the sun's heat to enter and warm the house

Page 28: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q3) Different ways to harness the sun's energy

There are three different ways to harness the sun's energy:

•passive solar,

•active solar

•and photovoltaic systems.

Photovoltaic systems directly convert sunlight into electricity

using a semiconductor material such as silicon. The electrical

energy from PVs can be stored in batteries for use when there is

no sun (during cloudy days or at night).

Page 29: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 3 (2 points)

What are photovoltaic cells made of?

A. thin slices of semiconductor materials

B. thin slices of rubber

C. thin slices of microchips

Page 30: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q4) First solar power aircraft In 1981, Paul Macready produced the first solar

powered aircraft. The aircraft used more than

1600 cells, placed on its wings. The aircraft flew

from France to England.

Page 31: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 4 (2 points) The first solar power aircraft was

produced in:

A. 1983

B. 1982

C. 1981

Page 32: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q5) THE FLIGHT OF SOLAR POWERED AIRCRAFT HELIOS

Helios (the name means sun in Greek) set out from Kauai in the

Hawaiian Islands before 9:00 AM on Monday, August 13, 2001.

Just over seven hours later, it reached 96,500 feet. Flying at

about 25 miles an hour, the mission lasted nearly 17 hours.

Helios had about 62,000 solar cells across the wing. The solar

cells collect energy from the Sun and convert it to electricity,

which runs the 14 small motors. The motors turn the 14

propellers, which are specially designed to pull the aircraft aloft

even in the very thin air that's 18 miles high.

Page 33: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 5 (2 points)

How many solar cells were used for the flight of Helios?

A. 65,000

B. 62,000

C. 63,000

Page 34: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q6) Solar cell efficiency

The basic PV or solar cell typically produces only a

small amount of power. To produce more power, solar

cells can be connected in series to make a PV module.

Solar cells or more photovoltaic modules form a PV

array. The amount of power solar panels produce is

determined by the quality of the solar panel, solar

cells and technology used in making the solar panel.

Conventional PV solar panels made from silicon wafers

convert about 14 to 17 percent of sunlight into usable

electricity. The latest solar panels that utilize the new

cell can convert into electricity 22 percent of the

sunlight they collect.

Page 35: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 6 (2 points) In the latest years solar technology has

advanced and the latest solar panels can

convert into electricity …………… percent

of the sunlight they convert

A. 17

B. 22

C. 25

Page 36: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q7) Silicon Silicon, a tetravalent metalloid, is a chemical element with

the symbol Si and atomic number 14. Silicon is the eighth

most common element in the universe by mass, but very

rarely occurs as the pure free element in nature. It is most

widely distributed in dusts, sands, planetoids,

and planets as various forms of silicon dioxide (silica)

or silicates. Over 90% of the Earth's crust is composed

of silicate minerals, making silicon the second most

abundant element in the Earth's crust (about 28% by mass)

after oxygen.

Page 37: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 7 (2 points) Silicon is the ……………….. most common

element in the universe by mass

A. eighth

B. second

C. sixth

Page 38: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q8) The Photovoltaic module

The heart of every PV system is the array of

photovoltaic modules. Today, the overwhelming

majority of PV modules (more than 95%) are

crystalline silicon, made from the second most

abundant element on earth.

Page 39: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 8 (2 points) The Photovoltaic module is

A. a group of photovoltaic cells

B. the photovoltaic generator

C. the inverter

Page 40: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q9) TYPES OF SOLAR PANELS

Solar panels work through what is called a photovoltaic

process – where radiation energy is absorbed and

generates electricity (voltaic). Radiation energy is

absorbed by semi conductor cells – normally silicon – and

transformed from photo energy (light) into voltaic (electrical

current).When the sun’s radiation hits a silicon atom, a

photon of light energy is absorbed, ‘knocking off’ an

electron. These released electrons create an electric

current. The electric current then goes to an inverter, which

converts the current from DC (direct current) to AC

(alternating current).The system is then connected to the

mains power or electricity grid.

Page 41: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 9 (2 points) Electric current is created when

A. a silicon atom 'knocks off' an electronB. a photon of light energy 'knocks off' an electronC. a solar sell 'knocks off' an electron

Page 42: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q10) The first solar cell

During this time several inventions were made that

contributed to the evolution of solar energy use. First

in 1883 the first solar cell was introduced. The cell

was to be wrapped with selenium wafers. Later in

1887 there was the discovery of the ultraviolet ray

capacity to cause a spark jump between two

electrodes. This was done by Heinrich Hertz. Later, in

1891 the first solar heater was created.

Page 43: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 10 (2 points) The first solar cell was constructed in:

A. 1839

B. 1891

C. 1883

Page 44: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7
Page 45: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q1) SOLAR CELLS: HISTORY AND USE

Solar cells produce direct current (DC) power which fluctuates

with the sunlight's intensity. For practical use this usually

requires conversion to certain desired voltages or alternating

current (AC), through the use of inverters. Multiple solar cells

are connected inside modules. Modules are wired together to

form arrays, then tied to an inverter, which produces power at

the desired voltage, and for AC, the desired frequency/phase.

Page 46: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 1 (1 point)

Solar (photovoltaic) cells produce direct current (DC) power:

True or False?

Page 47: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q2) CATEGORIES OF SOLAR ENERGY

Solar energy falls into three main categories: solar photovoltaic electricity, passive solar and solar thermal energy. All of them produce energy without releasing pollution particles or chemicals into the air. Photovoltaic cells are often called PVs for short. They absorb sunlight and turn it into electricity without using any moving parts. Instead, they use a chemical reaction to produce energy. Passive solar uses the sun for lighting and heat, also without moving parts. There are different kinds of passive solar devices. Some absorb sunlight and then slowly release it, even after the sun sets. Others simply bring as much light as possible into a room. A window can be a passive solar device. Solar thermal systems also collect the sun's energy, but they use mechanical devices to move water or air across surfaces that have absorbed sunlight to heat them.

Page 48: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 2 (1 point) Solar thermal systems don’t

require moving parts to work.

True or False?

Page 49: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q3) SOLAR POWER SYSTEMS

In a solar power system (also known as a photovoltaic system), power is produced for your home using a 3-part system. Solar panels, usually placed on your roof and facing south in the northern hemisphere, absorb sunlight and convert it into direct current. Mounting systems adjust the angle of your solar panels, to optimize energy absorption. Then an inverter converts the power from direct current to alternating current, making it usable for household appliances.

Page 50: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 3 (1 point) The inverter converts the power

from direct current to alternating current

True or False?

Page 51: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q4) PV systems performance

While summer has longer days and therefore more hours of direct sunlight, PV systems perform more efficiently at lower temperatures. A clear winter day with sun reflecting off of the snow may potentially produce more energy output than a hot summer day. The best situation is to have your panels face south in the northern hemisphere.

Page 52: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 4 (1 point) PV systems perform more

efficiently on a clear winter day than a hot summer day

True or False?

Page 53: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q5) PV systems performance

While summer has longer days and therefore more hours of direct sunlight, PV systems perform more efficiently at lower temperatures. A clear winter day with sun reflecting off of the snow may potentially produce more energy output than a hot summer day. The best situation is to have your panels face south in the northern hemisphere.

Page 54: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 5 (1 point) In the northern hemisphere, your

PV panels should face East.

True or False?

Page 55: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q6) Solar dishes

Solar dishes are efficient at collecting solar energy at very high temperatures. Solar dish/engine systems convert the energy from the sun into electricity at a very high efficiency. Using a mirror array formed into the shape of a dish, the solar dish focuses the sun’s rays onto a receiver. The receiver transmits the energy to an engine, that generates electric power.

Page 56: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 6 (1 point) Solar dish/engine systems are

efficient at very high temperatures.

True or False?

Page 57: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q7) Solar Power Towers

These systems produce electricity on a large scale. They are unique among solar technologies because they can store energy efficiently and cost effectively. They can operate whenever the customer needs power, even after dark or during cloudy weather.Power towers operate by focusing a field of thousands of mirrors onto a receiver located at the top of a centrally located tower.

Page 58: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 7 (1 point) Solar power towers cannot

operate after dark.

True or False?

Page 59: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q8) Helios Helios is the god that was associated the most with the Sun. That can be seen in his name, as the heliosphere is a term related to the Sun! Helios is considered to be able to see everywhere, and he labors everyday. He is carried while he sleeps to where his horses and chariot stand until Daphne (Dawn) appears, and then he has no rest until the day is done. Because he could see everywhere, he often revealed lots of secrets to the people they were being kept from! Helios was considered to be fairly mild-tempered, but when faced with certain situations, this was not necessarily true! Once when a huntress told Helios that she could catch a deer that could move as fast as he could, he got so enraged that he turned her into a doe!

Page 60: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Helios fell in love with Leucothoe,

who was the daughter of a king.

Helios took on the shape of her

mother so that he could enter her

home and be with her. However,

the Oceanid Clytia was

desperately in love with Helios.

She spread the story of the he and

Leucothoe everywhere.

Leucothoe's father found out

about and he had her buried alive!

He considered love to be a shame.

How sad!

(Q8) Helios in Love

Page 61: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 8 (1 point) Heliosphere is a word related to

the sun.

True or False?

Page 62: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q9) Grid-connected PV systems

Many residential systems are connected to the grid

wherever available, especially in developed countries with

large markets. In these grid-connected PV systems, use of

energy storage is optional. In certain applications such as

satellites, lighthouses, or in developing countries, batteries

or additional power generators are often added as back-

ups. Such stand-alone power systems permit operations at

night and at other times of limited sunlight.

Page 63: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 9 (1 point) In grid-connected PV systems,

use of energy storage is optional

True or False?

Page 64: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

(Q10) HISTORY OF SOLAR ENERGY

In 1839 a major milestone in the evolution of solar energy happened with the defining of the photovoltaic effect. A French scientist by the name Edmond Becquerel discovered this using two electrodes placed in an electrolyte. After exposing it to the light, electricity increased.In 1873, Willoughby Smith discovered photoconductivity of a material known as selenium. The discovery was to be further extended in 1876 when the same man discovered that selenium produces solar energy. Attempts were made to construct solar cells using selenium. The cell did not work out well but an important lesson was learned – that solid could convert light into electricity without heat or moving parts. The discovery laid a strong base for future developments in the history of solar power.

Page 65: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Question 10 (1 point) The first solar cell was

constructed using selenium and the results were positive. It worked out really well.

True or False?

Page 66: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7
Page 67: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Wrong answer !!!

Page 68: Category 2  (2p) Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

Right answer !!!