For every 100J of energy supplied For every 500J of energy in coal, 135J are An electric car is 85% efficient. The to a motor, 80J of useful work is transferred to a room as thmeral energy electricity for the car is supplied by a done. Calcualte the efficiency of from a coal fire. coal power station with a efficicent of the motor. Give your answer as a a. Calclate the efficiency. 35%. Determine how much energy is precentage. b. Suggest why fires are inefficient. needed from the chemical energy store of the coal for the car to provide 100J of useful energy. State non-renewable and Wood is a form of bio-fuel. Explain why a. Describe the difference between renewable energy sources. we can regard wood as a renewable energy and energy resource. Describe how 2 of these work. resource. b. Exlain why energy is conserved but an energy resources is not conserved. Suggest why fossile fuels re likely A local council has plants to extract shale Both bio-fuel and fossil fuels are to provide most of the world’s gas frm the ground and to burn the fuel. formed from plant and animals. energy for the foreseeable future. Suggest some cnsideration that the Explain why bio-fuels are renewable council needs to make before they decied resources but fossil fuels are wether to go ahead.
For every 100J of energy supplied to a motor, 80J of useful work is done. Calcualte the efficiency of the motor. Give your answer as a precentage. For every 500J of energy in coal, 135J are transferred to a room as thmeral energy from a coal fire. a. Calclate the efficiency. b. Suggest why fires are inefficient. An electric car is 85% efficient. The electricity for the car is supplied by a coal power station with a efficicent of 35%. Determine how much energy is needed from the chemical energy store of the coal for the car to provide 100J of useful energy. State non-renewable and renewable energy sources. Describe how 2 of these work. Wood is a form of bio-fuel. Explain why we can regard wood as a renewable resource. a. Describe the difference between energy and energy resource. b. Exlain why energy is conserved but an energy resources is not conserved. Suggest why fossile fuels re likely to provide most of the world’s energy for the foreseeable future. A local council has plants to extract shale gas frm the ground and to burn the fuel. Suggest some cnsideration that the council needs to make before they decied wether to go ahead. Both bio-fuel and fossil fuels are formed from plant and animals. Explain why bio-fuels are renewable resources but fossil fuels are
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