Energy and Efficiency 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: HeatherCreated on: 25-05-14 15:27 Name all of the forms of energy? Magnetic, Kinetic, Heat, light, gravitational potential, chemical, sound, electrical, elastic potential, nucleur 1 of 14 What is the desription of gravitational potential energy? Energy stored by raised objects-The higher the object, the higher is gravitational potential energy 2 of 14 What is the description of chemical energy? Stored energy in fuel, food and batteries 3 of 14 What is the description of sound energy Energy released by vibrating objects 4 of 14 What is the description of electrical energy? Energy in moving charges or static electric charges, 5 of 14 What is the energy transfer diagram for a car engine? Chemical energy in the fuel->Kinetic energy + Heat energy +Sound energy 6 of 14 What is the energy transfer diagram for a light bulb? Electrical energy-> Light + Heat energy 7 of 14 What is the law for energy? It cannot be created or destroyed 8 of 14 What is the efficiency of a device? The proportion of the energy supplues that is transferred in useful ways 9 of 14 What two things does the amount of electrical energy transfered depend on? -The appliances power -The length of time it is switched on, 10 of 14 What does this equation mean? E=P x t Energy transferred = power x time 11 of 14 What is the unit of power? There are two different units. -kW or kilowatts -Watts, W 12 of 14 What is the unit of time? There are two different units. Hours -Seconds 13 of 14 What is the unit for energy transferred? There are two different units. Kilowatt-hours kWH -Joules, J 14 of 14
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