Physics (Science A Unit 5) 0.0 / 5 ? SciencePhysicsGCSEAQA Created by: Gemma ParrettCreated on: 06-01-13 18:18 What is Infrared Radiation? Infrared Radiation is energy transfer by electromagnetic waves, detected with our skin 1 of 18 Do all objects emit or absorb infrared radiation? All objects emit infrared radiation 2 of 18 What surfaces are good absorbers of infrared radiation? Dark, matt surfaces. Light, shiny surfaces are good reflectors 3 of 18 What is the Specific Heat Capacity of a substance? The amount of energy required to raise the temperature of 1kg by 1 c 4 of 18 What is Conduction? Conduction is the movement of free electrons to transfer energy inside solids 5 of 18 What is the process of Convection? Fluids are heated and expand, becomes less dense and rises. As the fluid cools, it falls 6 of 18 Why do liquids evaporate into a gas? Because liquid molecules can escape the surface into the air. 7 of 18 What unit is energy measured in? Joules (J) 8 of 18 What is Payback Time? Time taken for an appliance to pay for itself, in terms of energy savings 9 of 18 Explain what a solar heating panel contains and where this comes from: Solar heating panels contain water radiated from the sun 10 of 18 What is power measured in? Power is measured in Watts (W) and Kilowatts (KW) 11 of 18 What is Conservation of Energy? Energy transferred from one place to another and the total amount of energy resulting the same. 12 of 18 Give an example of CoE: When an object falls, gravitational potential energy is transferred to kinetic energy 13 of 18 How do we find the efficiency of an APPLIANCE? Useful energy transferred by appliance DIVIDED BY total energy in it, then x100% 14 of 18 What is the equation for power? p (power)= e (energy) DIVIDED BY t (time) 15 of 18 What is the efficiency of POWER? Efficiency= Useful power out DIVIDED BY total power in, then x100% 16 of 18 The cost of the electrical energy supplied in an appliance is: total cost= number of kWh x cost per kWh 17 of 18 What does a vaccum flask do? A vaccum flask reduces the rate of energy transfer to keep hot things hot and cold thing cold 18 of 18
Comments
No comments have yet been made