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2 U1YESCO Module 21: Photovoltaic systems We can measure the energy of the Sun at the surface of the Earth in units called 'kilowatt-hours' (or kwh for short) 1 kwh is the amount of energy used by a small electric fire in one hour, or the energy that a single hundred-watt light bulb consumes in ten hours In fact, your electricity meter at home or school measures the electricity that you consume in the same units -kwh The Sun's energy that is available for collection depends on the intensity of the light, and on how long the Sun shines Sunny summer days, when the Sun is high in the sky, give more energy than cloudy winter days Close to the Earth's poles, the Sun does not move high in the sky, so the energy supplied by the Sun in the course of a year is greater near the Equator, and less near the Arctic and Antarctic To be able to compare the Sun's energy in different parts of the world, we measure how much energy falls on each square metre of land -we say kilowatt-hours per square metre (or kwh/ m2 for short) Then we add up all the energy that arrives from the Sun in the course of a year Measuring the Sun's energy helps us to find out how much solar energy we can use for our own purposes It can also tell us how big our solar panels need to be to collect enough of the Sun's energy Use the world solar energy map to answer these questions: 5 Compare northern Russia and central Australia Which one receives more solar energy each year? Can you say how much more? 6 Imagine that you are designing an emergency phone for use in remote areas It will be powered by a solar py system Would you need the same size of solar collector in each country (Russia and Australia) to gather equal amounts of energy? Try to explain your answer Page 2 7 List as many reasons as you can why some parts of the Earth receive more energy from the Sun in a year than others

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5 UlYESCO Module 21: Photovoltaic systems In many countries, most of the energy used in homes, factories and schools comes (from burning fossil fuels such as coal, oil and gas This has three main drawbacks Firstly, the process of taking fossil fuels out of the ground can cause damage to the environment This can include damage caused by the extraction machinery and by the pollution that is a by-product of extraction Secondly, fossil fuels give off gases when they are burned Some of these gases can cause environmental problems, such as acid rain Others, such as carbon dioxide (COz> may be causing a change in the global climate -you may have heard the terms "Greenhouse Effect" or "Global Warming" Thirdly, fossil fuels are not free They cost money to bring out of the ground This means that as fossil fuels run out, their price will increase At present, in most countries the cost of electricity from fossil fuels does not include the cost of the damage they cause to the environment This is called the "external" costs If these were included, the price of this type of electricity would be higher The table below compares the costs of electricity from various sources When there is a main electricity grid nearby, electricity from solar PV is still expensive compared to electricity from fossil fuels, and it will take some years before PV is competitive in grid-connected situations However, many technologies that were once expensive are now much cheaper These include things like calculators, digital watches, and personal computers This is the same with solar PV technologies In remote areas of the world it can be cheaper to use a solar elecuic PV system rather than building new pylons and wires In these places, we say that it is more cost-effectiveto use PV Figures are for grid supplies in US cents Figures in Euros are similar at publication date Page 4

6 U/YESCO Nodule 21: Photovoltaic systems Activity 5: Comparing costs i) Find out how much your family (or someone you know) pays for a kilowatt-hour (kwh) of electricity at home or at school ii) How does this compare with the total costs per kwh of electricity in the table? You may have to find out how to convert between currencies iii) If you have a supplier of py systems nearby, find out how much electricity from their technology costs Compare this with the costs shown in the table You may include this data in the "additional information" section of the exchange form if you wish Page 5

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