Energy - Nuclear Energy Can we live without energy? Naturally no! People and animals need energy to survive. Food is the source of energy. Carbohydrates “are burned” in the body. Energy, CO2 and water are produced. Agriculture production needs also energy (for seeding, production and transport). Modern life is always in small or bigger cities. If we haven´t any energy, we wouldn´t have our usual modern life style. Demand on energy is increasing If the world population is increased, more energy is needed. Because more people need more food. In the past the most of production was done by manual work. Nowadays manual work has been replaced by machines. For example, in every household there is a washing machine, a dish washer, a fridge, a micro wave, a car and television. Altogether they need a lot of energy/electric­ity­. We shouldn´t forget the demand of energy for central heating. How to save energy Energy can be saved by modern technologies. Old cars needs much more fuel then modern cars. The modern household appliances need less energy than old machines. Isolation of the house walls and modern windows can also save a lot of heat energy. Nuclear en..
Which alternative forms of renewable energy hold the greatest promise? Presentation in English Introduction The energy consumption is rising exponentially. With this, the environmental impact of burning fossil fuels has increased dramatically. To satisfy the future demand of energy it is necessary to think of new and alternative ways to generate energy for our daily life. What alternatives do we have? Photovoltaic cells (PV-cells) Principle: PV-cells allow the direct conversion of sunlight into electricity. Many houses today carry PV-cells on the rooftop. In some areas large fields of PV-panels have been installed to generate electricity. Advantage: No waste of resources. No environmental pollution by the operation of the modules. Efficiency: up to 35% under concentrated sunlight. Disadvantage: The production of the modules might cause some environmental problems but they can be fully recycled. Limitations: Life cycle of 20 to 30 years for the PV-modules with slightly decreasing efficiency over time. An economic operation is only given in areas where sufficient sunshine is to be expected. Conclusion: In 2020 about 1bn people could be supplied with solar electricity. Although the sun has endless power, we can only use a fraction of it. Conclusion: In 2020 about 1bn people could be supplied with solar electricity. Although the sun has endless power, we can only use a fraction of it. Geothermic power
Alternative Sources of Energy
Good morning, ladies and gentlemen.
I’d like to tell you something about the topic alternative sources of energy.
Definition: First I want to give you a short definition about alternative sources of energy. Alternative energy is energy that is neither based on fossil fuels nor on the splitting of atoms. It is usually a renewable source of energy that could be used should fossil fuels run out.
I want now like to turn to the question: Why do we need alternatives.
To answer that question, we need to start by discussing fossil fuels-what they are and the advantages and disadvantages of fossil fuels. Within this context, the pressing need for alternatives becomes quite clear.
Most fossil fuels are formed from the remains of long-dead creatures and plants. Buried over the course of hundreds of millions of years, these carbon-based deposits have been converted by heat and pressure over time into such combustible substances as crude oil, coal, natural gas, oil etc.
I would now like to say a few words about the advantages of fossil fuels.
·A major advantage of fossil fuels is their capacity to generate huge amounts of electricity in just a single location.
·Fossil fuels are very easy to find.
·When coal is used in power plants, they are very cost effective.
·Transporting oil and gas to the power stations can be made through the use of pipes making it an easy task.
·Power stations that make use of fossil fuel can be constructed in almost any location.
Let’s now turn to disadvantages and so to the question Why do we need alternatives.
·Pollution is a major disadvantage of fossil fuels. This is because they give off carbon dioxide when burned thereby causing a greenhouse effect. This is also the main contributory factor to the global warming experienced by the earth today.
·Another point is that at current rates, the world uses fossils fuels 100,000 times faster than they can form.
·Drilling for oil, transporting volatile liquids and explosive gases etc, all these can determine tragic accidents for example the oil catastrop.....[read full text]
Now I want to discuss the advantages and disadvantages of hydropower.
•Once a dam is constructed, electricity can be produced at a constant rate.
•Expense of power production is very low. And here I have a statistic that shows that the average power production expense per KWh of hydroelectric are very low in vergleich with other sources of energy.
•If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high.
•Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades
•When in use, electricity produced by dam systems do not produce greenhouse gases. They do no.....
Energy Output: Biofuels have a lower energy output than traditional fuels and therefore require greater quantities to be consumed in order to produce the same energy level.
·Food Prices: As demand for food crops such as corn grows for biofuel production, it could also raise prices for necessary staple food crops.
·Water Use: Massive quantities of water are required for proper irrigation of biofuel crops as well as to manufacture the fuel, which could strain local and regional water resources.Availability: Biofuels are not widely available for consumer purchase and most vehicles are not equipped to run on biofuel products.
Limited availability reduces the desirability of biofuels as a.....