Energy REvision map
- Created by: DGL
- Created on: 28-03-21 20:34
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- Energy
- Energy and temperature
- Temperature is measured in degrees Celsius (°C).
- Internal (thermal) energy is measured in joules (J).
- The amount of thermal energy stored in
something depends on:
- ? how hot it is (its temperature)
- ? the material it is made from
- ? its mass.
- The amount of thermal energy stored in
something depends on:
- When two objects are at different temperatures, energy will be transferred from the hotter one to the cooler one until they are at the same temperature.
- Transferring energy
by heating
- Energy can be transferred by heating in
different ways.
- Evaporation can take place from a liquid at any temperature.
- When part of a liquid
evaporates, it is the fastest-moving particles that escape to form a gas.
- The particles that are left are storing less energy as movement and so the temperature of the remaining liquid is lower.
- When part of a liquid
evaporates, it is the fastest-moving particles that escape to form a gas.
- Conduction takes place in solids and can also happen in liquids
(although not very well).
- The particles in
a solid are held together tightly.
- When they gain energy
they vibrate faster and further, and the vibrations are passed on.
- Metals are the best
conductors.
- Most other solids are poor conductors.
- Metals are the best
conductors.
- When they gain energy
they vibrate faster and further, and the vibrations are passed on.
- The particles in
a solid are held together tightly.
- Convection takes place in fluids (liquids and gases).
- When part of a fluid
is heated, the particles spread further apart and the fluid becomes less dense.
- This makes it rise. As it rises it meets cooler fluid and passes the energy on. More cool fluid moves in to replace the rising fluid, setting up a convection current.
- When part of a fluid
is heated, the particles spread further apart and the fluid becomes less dense.
- Infrared radiation can transfer energy through empty space and also
through transparent materials.
- Any hot or warm
object gives off or emits radiation.
- When something takes in energy from radiation, it is said to absorb it.
- Any hot or warm
object gives off or emits radiation.
- Evaporation can take place from a liquid at any temperature.
- Energy can be transferred by heating in
different ways.
- Power
- Power is the rate at which energy is transferred.
- Power is measured in watts (W) or kilowatts (kW).
- Power is the rate at which energy is transferred.
- Efficiency
- Not all energy is transferred usefully.
Wasted energy is often transferred by heating. The percentage of useful
energy produced by something is known as its efficiency.
- Sankey diagrams shows the energy
transfers
- The width of each arrow shows the amount of energy it represents.
- Sankey diagrams shows the energy
transfers
- Not all energy is transferred usefully.
Wasted energy is often transferred by heating. The percentage of useful
energy produced by something is known as its efficiency.
- Energy and temperature
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