14.1 m/s Light Electrical Electrical Sound (a) 0.69 J 5.48 m s-1 (a) Chemical Heat 5.48 m s-1 Kinetic Electrical (a) 224 m s-1 Water is stored in a high Air resistance is slowing reservoir behind a dam. the skydiver down. The water is released through the dam in to a (a) 1.6 J low level reservoir. 3.2 m The gravitational potential energy of the is turned (a) 810 000 J in to kinetic energy, which 600 000 J turns turbines which 210 000 J generate electricity. 9.2 m s-1 Heat energy is lost to the 1.96 m s-1 surroundings in many places (boiler, etc.) 21.4 m s-1 (a) 25 kJ The image of the 16 250 J document is projected on Missing energy is lost as to a positively charged heat and sound energy copying plate. to the surroundings. Where light is incident on the plate, charge leaks (a) 60 % away. 5 % The negatively charged 2795 J toner particles are 12 160 000 J attracted to the remaining 108 000 J positive areas. 4 875 000 J Paper is placed over the copying plate. 35 % The toner is transferred to the paper and sticks after 486 J heating. (a) Electrical Sound up’ a static duster ‘Fluffing 5488 J causes it to become charged. This attracts 6 240 000J charged particles to the 792 000 J duster. Efficiency (p14 15) Electrical Charge (p16 17) (a) The droplets of paint – – have the same charge so (a) Electrical Light spread out more when Electrical Heat sprayed. This keeps the Gravitational Potential coat of paint even. Kinetic
14.1 m/s (a) 0.69 J 5.48 m s-1 5.48 m s-1 (a) 224 m s-1 Air resistance is slowing the skydiver down. (a) 1.6 J 3.2 m (a) 810 000 J 600 000 J 210 000 J 9.2 m s-1 1.96 m s-1 21.4 m s-1 Efficiency (p14 – 15) (a) Electrical Light Electrical Heat Gravitational Potential Kinetic Light Electrical Electrical Sound (a) Chemical Heat Kinetic Electrical Water is stored in a high reservoir behind a dam. The water is released through the dam in to a low level reservoir. The gravitational potential energy of the is turned in to kinetic energy, which turns turbines which generate electricity. Heat energy is lost to the surroundings in many places (boiler, etc.) (a) 25 kJ 16 250 J Missing energy is lost as heat and sound energy to the surroundings. (a) 60 % 5 % 2795 J 12 160 000 J 108 000 J 4 875 000 J 35 % 486 J (a) Electrical Sound 5488 J 6 240 000J 792 000 J Electrical Charge (p16 – 17) The image of the document is projected on to a positively charged copying plate. Where light is incident on the plate, charge leaks away. The negatively charged toner particles are attracted to the remaining positive areas. Paper is placed over the copying plate. The toner is transferred to the paper and sticks after heating. ‘Fluffing up’ a static duster causes it to become charged. This attracts charged particles to the duster. (a) The droplets of paint have the same charge so spread out more when sprayed. This keeps the coat of paint even.
Electricity-and-Energy-Problem-Booklet-sbu8z8.docx