Energy
- Created by: Ebod
- Created on: 24-07-21 12:48
View mindmap
- Energy
- Heating
- Conduction
- vibrating particles transfer energy to neighbouring particles via collisions
- Thermal Conductivity
- How quickly energy is transferred to a material via conduction
- Convection
- a region of a fluid is heated so the particles spread due to random diffusion
- as the energetic particles spread, the heated region becomes less dense
- the less dense, heated particles rise causing the cooler, less heated particles to sink
- heated region above loses its energy and starts to sink, whereas the cooler region gets heated and rises
- the less dense, heated particles rise causing the cooler, less heated particles to sink
- as the energetic particles spread, the heated region becomes less dense
- a region of a fluid is heated so the particles spread due to random diffusion
- Insulation
- something that reduces the rate of energy transfer by heating
- thick walls out of a material with low thermal conductivity
- cavity walls (walls with an air gap in between) as conductivity in fluids is low
- cavity wall insulation (foam that wills the air gap)
- loft insulation (fibreglass wool with pockets of trapped air)
- double glazed glass (like cavity walls, has an air gap between)
- cavity walls (walls with an air gap in between) as conductivity in fluids is low
- Specific heat capacity
- energy required to raise the temperature of 1kg of a substance by 1°C
- C = E / (change in T x m)
- energy required to raise the temperature of 1kg of a substance by 1°C
- Conduction
- Energy Sources
- Renewable
- Wind
- Solar
- Bio-fuel
- Tides
- Geothermal
- Hydro-electric
- Non-renewable
- Coal
- (Natural) Gas
- Oill
- Nuclear
- isn't a greenhouse gas but makes radioactive waste
- fossil fuels result in greenhouse gases, which contribute to global warming
- Renewable
- Work, Power and Efficiency
- Power
- W = J / s
- P = W / t
- P = E / t
- rate of energy being transferred or work being done
- W = J / s
- Energy conservation
- Conservation of energy
- energy cannot be created or destroyed, only transferred
- Energy Dissipation
- Not all energy transferred is useful; some is wasted
- Efficiency
- Efficiency = Useful energy output / Total energy Input
- Efficiency = Useful Power output / Total Power input
- Can be increased via lubrication and the use of thermal insulation
- Conservation of energy
- Work
- Work Done = Energy Transferred via a force or when current flows
- Work done = Voltage x Charge
- J = VQ
- Work done = Force x Distance
- J = Nm
- Work done = Voltage x Charge
- Work Done = Energy Transferred via a force or when current flows
- Power
- Changes in Energy Storea
- kinetic energy
- Ek =
1/2mv^2
- J = 1/2 x kg x (m/s)^2
- Ek =
1/2mv^2
- thermal energy
- change in E = m x c x change in T
- J = kg x J/°C x °C
- dissipated heat energy can be reduced via lubricants (e.g oil)
- change in E = m x c x change in T
- elastic potential energy
- Ee = 1/2ke^2
- J = 1/2 x N/m x m^2
- Ee = 1/2ke^2
- gravitational potential energy
- Eg = mgh
- J = kg x N/m x m
- Eg = mgh
- chemical energy
- nuclear energy store
- magnetic energy
- system
- A system is an object or group of objects.
- kinetic energy
- Heating
Similar Physics resources:
Teacher recommended
Comments
No comments have yet been made