5 % The negatively charged 2795 J particles are attracted 12 160 000 J to the remaining positive 108 000 J areas. 4 875 000 J Paper is placed over the copying plate. 35 % The is transferred to the paper and sticks after 486 J heating. (a) Electrical Sound up’ a static ‘Fluffing 5488 J duster causes it to become charged. This attracts Efficiency (p14 15) 6 240 000J charged particles to the – 792 000 J duster. (a) Electrical Light Electrical Charge (p16 17) (a) The droplets of – Electrical Heat have the same charge Gravitational so spread out more when Potential Kinetic sprayed. This keeps the Light Electrical coat of paint even. Electrical Sound The car body has an opposite charge so (a) Chemical Heat paint drops that would Kinetic Electrical miss are attracted to it. Water is stored in a (a) When you unroll high reservoir behind a cling film, negative charges dam. (electrons) from one layer The water is released get pulled across to the through the dam in to a other. low level reservoir. This creates patches of The gravitational potential positive and negative energy of the water is charges. turned in to kinetic energy, The plastic bowl is an which turns turbines which electrical insulator. generate electricity. The negative charges can flow through the Heat energy is lost to conducting metal bowl the surroundings in many and away from the cling places (boiler, etc.) film. (a) 25 kJ (a) Air and dust The image of the 16 250 J particles enter the document is projected on Missing energy is lost precipitator through a to a positively charged as heat and sound negatively charged metal copying plate. energy to the grid. light is incident on the surroundings. The dust particles can be plate, charge leaks away. charged but the air (a) 60 % particles can’t.
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 water 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. light is incident on the plate, charge leaks away. The negatively charged particles are attracted to the remaining positive areas. Paper is placed over the copying plate. The 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 have the same charge so spread out more when sprayed. This keeps the coat of paint even. The car body has an opposite charge so paint drops that would miss are attracted to it. (a) When you unroll cling film, negative charges (electrons) from one layer get pulled across to the other. This creates patches of positive and negative charges. The plastic bowl is an electrical insulator. The negative charges can flow through the conducting metal bowl and away from the cling film. (a) Air and dust particles enter the precipitator through a negatively charged metal grid. The dust particles can be charged but the air particles can’t.
Electricity-and-Energy-Problem-Booklet-St-Lukes.docx