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Name:______________________________________ Date: ______________________ Heat and Temperature Unit: Chapter 7 Questions Sources of Thermal Energy (pgs. 238 – 247) Science 7 After reading pages 238 to 247 in your textbook, please answer the following questions. 1. What are two ways of producing electrical energy? Give 1 advantage and 1 disadvantage of each. _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ 2. How is mechanical energy converted to thermal energy? Give two examples of this. _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ 3. What is the difference between active and passive solar energy? _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ 4. What is the “greenhouse effect” and why does it pose a problem? How are greenhouse gases involved? _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Multiple Choice: 1. Much of the energy used in Alberta is found in the vast resources of fossil fuels. This type of energy source is useful and is stored until we need it. Fossil fuels are considered to be sources of a) b) c) d) chemical energy industrial energy biological energy geothermal energy 2. Electrical energy can be generated at a dam, using generators and can also be generated by thermalelectric generating stations which burn coal. The central reason that thermo-generating stations are used is because a) b) c) d) coal is so abundant it is cheaper and cleaner a large waterfall is not always available heated water is more efficient 3. Thermal energy from inside the Earth’s crust can be harnessed as a useful thermal energy source. Volcanoes, hot springs and geysers are examples of this type of thermal energy source. This type of thermal energy is a) b) c) d) an environmental pollutant a clean alternative to using fossil fuels called geovolcanic energy used to generate fossil fuel resources 4. Co-generation is the use of a) b) c) d) electrical energy to get waste energy waste energy to generate electrical energy waste energy to generate mechanical energy mechanical energy to generate waste energy