The rate at which an object transfers energy by heating depends on: the surface area, volume and material of the object and the nature of the surface with which the object is in contact. The
bigger the temperature difference between a body and its surroundings
, the faster the rate at which heat is transferred
What causes energy to transfer?
Transferring energy
mechanical work
– a force moving an object through a distance. electrical work – charges moving due to a potential difference. heating – due to temperature difference caused electrically or by chemical reaction.
What 3 factors affect the transfer of energy?
We assume that there is no phase change and that no work is done on or by the system. Experiments show that the transferred heat depends on three factors—
the change in temperature, the mass of the system, and the substance and phase of the substance
. Figure 1.
What affects the rate of conduction?
The process of heat conduction depends on four basic factors:
the temperature gradient
, the cross section of the materials involved, their path length, and the properties of those materials.
What transfers energy faster?
Convection
transfers heat energy through gases and liquids. As air is heated, the particles gain heat energy allowing them to move faster and further apart, carrying the heat energy with them. Warm air is less dense than cold air and will rise.
What factors contribute to energy transfer not being 100% efficient?
The
more energy lost to heat, sound and light
in an energy transfer, the more inefficient the transfer is.
What kind of energy can be transferred?
Although electrical energy is stored and transferred differently than the energy used by your body, all energy can make things happen.
Motion energy, heat energy, sound energy and light energy
can all be transferred from place to place.
What are the 4 energy transfers?
- Mechanically – By the action of a force.
- Electrically – By an electrical current.
- By radiation – By Light waves or Sound waves.
- By heating – By conduction, convection or radiation.
What are the 4 energy pathways?
They are: ‘
electrical energy’, ‘sound energy’, and ‘light energy
‘.
How energy is transferred in current?
An electric current transfers
energy stored chemically that was stored in the fuel
(and oxygen) in a power station to the surroundings where it is stored thermally. When the electric current passes through the filament, the filament warms up. … The 36 W lamp is the brightest and so radiates most energy per second.
Does thermal conductivity depend on density?
Thermal conductivity is a material property. It will not differ with the dimensions of a material, but it is dependent on
the temperature
, the density and the moisture content of the material. The thermal conductivity of a material depends on its temperature, density and moisture content.
Which factor does not affect convection?
The volumetric specific heat of carrying medium
.
What two factors affect the rate of thermal energy transfer?
The rate at which an object transfers energy by heating depends on:
the surface area, volume and material of the object and the nature of the surface with which the object is in contact
. The bigger the temperature difference between a body and its surroundings, the faster the rate at which heat is transferred.
Which mode of heat transfer is fastest?
Radiation
is the fastest because in this case, the transfer of heat takes place at the speed of light. 5. Both conduction and convection need a material medium for the transfer for heat.
Which is faster conduction or convection?
The molecules of a hotter material move faster and therefore have higher kinetic energy than the molecules of a cooler material. Convection can be many times faster than conduction alone. …
Which action can transfer the greatest amount of heat?
Conduction
is the most significant form of heat transfer within a solid object or between solids in thermal contact. Conduction is most significant in solids, and less though in liquids and gases, due to the space between molecules.
