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प्रश्न
Write a short note on electrical energy generation and environment.
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उत्तर
- Today, generating electrical energy has become essential. Life without electricity is unimaginable. Electrical energy is generated through various methods. A generator, based on the principle of electromagnetic induction, is used. The generator is rotated by a turbine, which is powered by energy sources.
- These energy sources can be renewable (e.g., wind, sunlight) or non-renewable (e.g., coal, petrol, water). Renewable sources like wind and sunlight are environmentally friendly and economical. They do not pollute the environment.
- However, non-renewable sources like coal, natural gas, and nuclear fuels harm the environment. Burning fossil fuels releases soot particles and greenhouse gases like carbon dioxide and carbon monoxide. These gases cause air pollution and contribute to global warming.
- Nuclear waste also emits harmful radiation, which affects both humans and the environment. We must find eco-friendly alternatives to fossil fuels. Switching to green energy sources is crucial to saving our planet.
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संबंधित प्रश्न
Name some of the solar energy devices.
What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours?
Name the device which converts sunlight into electricity.
How much solar energy will be received by 1 m2 area in one hour if the solar constant be 1.4 kW/m2?
Explain why, a plane mirror reflector is used in a box-type solar cooker.
Name the semi-conductor material which is usually used for making solar cells.
Why is the solar cooker box painted black from inside?
Why is the solar cooker box covered with a glass sheet?
Solar cells are used to provide the electric current to charge the batteries of a car driven by an electric motor. Describe the energy changes which take place.
What differences would you expect in the charging of car batteries (i) in bright sunlight (ii) on a cloudy day (iii) at night?
Name two devices which can be utilised for the cooking of food so as to save fuel.
What steps would you suggest to reduce energy consumption?
Draw neat and labelled diagram.
One solar panel produces a potential difference of 18 V and current of 3 A. Describe how you can obtain a potential difference of 72 Volts and current of 9 A with a solar array using solar panels. You can use sign of a battery for a solar panel.
Re-write the statement by selecting the appropriate option.
The solar lamp uses the ................... energy.
Power available from solar cells : DC : : power require to run domestic equipments : _________
The potential difference available from a solar cell depends on its area.
Complete the table.
| Limitations of Solar energy | Limitations of Wind energy |
______ is considered as a great source of energy.
Observe the figure and label it properly:
- What is the figure related to?
- Why are reflectors used?
- Draw a flow chart showing different stages in such a process.
- How is the process used to generate electricity?
- What other method can be used to generate electricity using the same energy source?
