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Questions and Answers
Which of the following is a direct energy conversion process performed by solar cells?
Which of the following is a direct energy conversion process performed by solar cells?
- Chemical energy to electrical energy
- Solar energy to electrical energy (correct)
- Mechanical energy to electrical energy
- Thermal energy to electrical energy
What is the primary function of semiconductors within solar cells?
What is the primary function of semiconductors within solar cells?
- To store excess energy for later use
- To convert solar energy directly into electrical energy (correct)
- To filter specific wavelengths of light
- To regulate the temperature of the solar cell
Why is the development and use of solar cells considered a modern method for preserving the environment?
Why is the development and use of solar cells considered a modern method for preserving the environment?
- They directly reduce pollution from the use of fossil fuels. (correct)
- They are visually appealing and promote green initiatives.
- They eliminate the need for traditional power grids.
- They are made from recyclable materials.
Benban Station in Aswan is notable for what specific characteristic?
Benban Station in Aswan is notable for what specific characteristic?
In a photocell, what initiates the flow of electrical current?
In a photocell, what initiates the flow of electrical current?
How is the efficiency of a solar cell typically determined?
How is the efficiency of a solar cell typically determined?
What factors can affect the ability of a solar cell to consistently generate electricity throughout the day?
What factors can affect the ability of a solar cell to consistently generate electricity throughout the day?
What is the primary goal of using nanotechnology in the development of solar cells?
What is the primary goal of using nanotechnology in the development of solar cells?
If a solar cell converts all light energy that falls on it into electrical energy, what is its efficiency?
If a solar cell converts all light energy that falls on it into electrical energy, what is its efficiency?
What formula accurately calculates the efficiency of a solar cell?
What formula accurately calculates the efficiency of a solar cell?
What characterizes solar water heaters in terms of their performance and utility?
What characterizes solar water heaters in terms of their performance and utility?
How do solar-powered air conditioners benefit residents of hot countries?
How do solar-powered air conditioners benefit residents of hot countries?
What is a primary advantage of using solar lamps for home use?
What is a primary advantage of using solar lamps for home use?
Why is wind energy considered an environmentally friendly alternative energy source?
Why is wind energy considered an environmentally friendly alternative energy source?
What causes the turbine blades in a wind turbine to move?
What causes the turbine blades in a wind turbine to move?
What is a critical factor in determining the efficiency of wind turbines?
What is a critical factor in determining the efficiency of wind turbines?
Why are dams essential for hydroelectric power generation?
Why are dams essential for hydroelectric power generation?
In the context of hydroelectric power, what role do turbines play?
In the context of hydroelectric power, what role do turbines play?
What is the role of electrical generators in a hydroelectric power plant?
What is the role of electrical generators in a hydroelectric power plant?
Considering the operational principles of solar cells, wind turbines, and hydroelectric dams, what is a common characteristic that allows them to be classified as renewable energy sources?
Considering the operational principles of solar cells, wind turbines, and hydroelectric dams, what is a common characteristic that allows them to be classified as renewable energy sources?
Flashcards
Renewable resources
Renewable resources
Resources that can be used repeatedly and are naturally replaced, such as solar, wind, hydro, geothermal, and biomass energy.
Solar cells
Solar cells
Devices made of semiconductors that convert solar energy directly into electrical energy.
Photocell operation
Photocell operation
When light hits a semiconductor like silicon, photons displace electrons creating a potential difference and electrical current.
Solar cell efficiency
Solar cell efficiency
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Electrical energy and power
Electrical energy and power
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Solar cell efficiency calculation
Solar cell efficiency calculation
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Solar water heaters
Solar water heaters
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Solar air conditioners
Solar air conditioners
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Solar lamps
Solar lamps
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Wind Energy
Wind Energy
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Hydroelectric power
Hydroelectric power
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Study Notes
- Renewable resources can be used repeatedly and are naturally replaced
- Examples of renewable resources are solar, wind, hydro, geothermal, and biomass energy
Solar Cells
- Solar cells are made of semiconductors that convert solar energy directly into electrical energy
- Using solar cells helps preserve the environment and reduce pollution from fossil fuels.
- The BENBAN STATION in Aswan is considered the capital of solar energy.
- It consists of 32 solar stations with a capacity of 1465 megawatts.
- Photons in light displace electrons on the surface of a semiconductor, creating a potential difference
- This potential difference can create an electric current if connected to an external circuit.
- A solar cell's efficiency is determined by comparing the electrical energy produced to the light energy from the sun.
- 100% efficiency is only possible if the cell converts all light energy into electrical energy
- The ability of a solar cell to generate electricity varies based on the angle of the sun's rays, clouds, and environmental factors like wind, dust, and humidity
- Nanotechnology can improve the efficiency of solar cells by using materials that absorb sunlight more efficiently
- Electrical energy (E) is calculated in joules using the formula E = VIt, where:
- V is voltage in volts (V)
- I is current in amperes (A)
- t is time in seconds (s)
- Power (P) is measured in watts (W), representing energy produced or consumed per second, and is calculated as P = VI
- Solar cell efficiency calculation: (electrical power produced / optical power falling on the cell) x 100
Devices Using Solar Energy
- Solar energy can be used in devices, such as:
- Solar heaters
- Used to heat water for multiple purposes, reducing electricity use and high efficency
- Air Conditioners
- Solar-powered air conditioners reduce electricity consumption
- Solar Lamps
- Used to illuminate and decorate gardens and can serve as an alternative source of lighting using less electricity and are automatic
- Solar heaters
Wind Energy
- Wind energy is a clean electrical energy
- It relies on wind turbines, which have blades, turbines, and generators
- Air flows over the blades, creating different pressure zones that cause the blades to move
- The turbine blades are connected to a generator that converts kinetic energy into electrical energy
- Efficient wind turbines are built in open areas such as deserts and high altitude areas, that have higher wind speeds.
Hydroelectric Power
- Dams store water in a reservoir, giving it potential energy
- Gates on the dam control water flow
- When gates open, water flows downstream and rotates turbines
- The turbine generate electrical energy.
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