The worksheet answered
1:- energy is the ability of a system to cause exterior impacts, for instance a force
across a distance. Input or output of work changes the energy content of a body.
Energy exists in many different forms such as:
• potential energy
• kinetic energy
• thermal energy
• magnetic energy
• electrical energy
• radiation energy
• nuclear energy
2:-Types of energy can be categorised into two broad categories – kinetic
energy (the energy of moving objects) and potential energy (energy that
is stored). These are the two basic forms of energy. The different types of
energy include thermal energy, radiant energy, chemical energy, nuclear
energy, electrical energy, motion energy, sound energy, elastic energy
and gravitational energy.
3:- Renewable energy is energy that has been derived from earth's
natural resources that are not finite or exhaustible, such as wind and
sunlight. Renewable energy is an alternative to the traditional energy
that relies on fossil fuels, and it tends to be much less harmful to the
.environment
4:- renewable and non-renewable. Non-renewable energy includes
coal, gas and oil. ... They are made by burning fossil fuels to create
energy. Renewable energy includes solar, hydro and wind energy.
Wind energy is made when the wind moves the blades on a wind
.turbine
5:- The most popular renewable energy sources currently
:are
:The most popular renewable energy sources currently are
.Solar energy
.Wind energy
Hydro energy
Tidal energy
Geothermal energy
Biomass energy
The worksheet answered 2
1:-
Some of the major application of solar energy are as
follows: (a) Solar water heating (b) Solar heating of buildings
(c) Solar distillation (d) Solar pumping (e) Solar drying of
agricultural and animal products (f) Solar furnaces (g) Solar
cooking (h) Solar electric power generation (i) Solar thermal
power production (j) Solar green houses.
2:-(1) Use of direct solar energy
solar thermal power plants
•
photolysis systems for fuel production
•
solar collectors for water heating
•
passive solar heating systems
•
photovoltaics, solar cells for electricity generation •
(2) Indirect use of solar energy
evaporation, precipitation, water flow •
melting of snow •
wave movements •
ocean currents •
biomass production •
heating of Earth’s surface and the atmospher wind e
3:-(1)Advantages
Solar energy produces power for households and businesses
through solar panels, which contain solar cells that harness
energy from the sun. To produce power, solar cells require
daylight, but even if it's cloudy, you can still use the solar
panel system
(2)Disadvantages
Interior needs - Not all households that can satisfy their
requirements and get the optimum out of their solar cells yet.
Solar cells are very sensitive in terms of their location, which
means that if there is shade on your lot, it is difficult to exploit
solar installation optimally. The solution to this is that you
can be connected to the grid and hence can buy energy from
others
4:- Photovoltaic (PV) effect is the conversion of sunlight
energy into electricity. In a PV system, the PV cells exercise
this effect. Semi-conducting materials in the PV cell are doped
to form P-N structure as an internal electric field
5:- Photovoltaic (PV) panels are comprised of individual cells
known as solar cells. Each solar cell generates a small
amount of electricity. When you connect many solar cells
together, a solar panel is created that creates a substantial
amount of electricity. PV systems vary in size, depending
upon the application: it can vary from small, rooftop-mounted
or building-integrated systems with capacities of tens of
kilowatts to large utility-based stations that generate
hundreds of megawatts of electrical power. There are PV
systems that are connected to the power grid (grid-direct or
grid-hybrid systems), and there are systems that allow a user
to disconnect from the grid (off-grid (or stand-alone)
.)systems
6:- A photovoltaic cell is the most basic unit of a solar PV
system - solar cells can be either monocrystalline or
polycrystalline, and their key characteristic is that they
produce a voltage output when exposed to light. It is
important to note that although they are normally called "solar
.cells", they can respond to any type of light
A photovoltaic module consists of multiple PV cells
connected in series to provide a higher voltage output. PV
modules are manufactured in standard sizes such as 36-cell,
60-cell and 72-cell modules. The term solar panel is
sometimes used interchangeably with solar module. The main
difference is that some solar panels models are composed of
.multiple modules mounted together
A photovoltaic array is a system composed of multiple PV
modules. They can be connected in one or more series
circuits, which are connected to a combiner box to provide a
single direct-current output. This output can be used to
charge batteries, power DC loads, or fed to an inverter to
provide an AC voltage for home appliances or exporting to
the electric grid
7:- Passive Sytems
Passive Solar Space Heating: Passive solar heating systems
are a simple and cost effective way to take advantage of the
sun’s free, renewable energy and displace the need for
electricity, natural gas, or other active energy systems.
Strategic planning of building location, orientation, and
materials provide great control over the inside temperature.
Installing large south facing windows, planting shade trees,
and using Trombe walls, which are made of absorptive
materials that store heat during the day and slowly release it
at night, are measures that can be adopted for new and old
buildings alike. Sunspaces or glass rooms built on the south
side of a building can provide up to 60 percent of a home’s
winter heating. Regardless of climate, solar energy can be
harnessed as long as the building has adequate insulation
.and ventilation
Active Systems
Active Solar Space Heating: In an active solar space heating
system, a collector holding a heat-transfer medium such as
air or liquid captures the sun’s thermal energy, which is then
distributed through the building via electric fans or pumps.
Currently, there are no pre-fabricated residential solar heating
systems, so interested customers must hire a specialized
engineering firm to design an adequate system. The costs for
such custom systems range from $3,000 to $10,000
depending on the size of the space. With savings in electricity
or natural gas, active solar heating systems can pay for
.themselves in 7 to 10 years
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