Physics Homework [Energy 6] Flashcards
29.03.25
State the part of the internal energy that changes if the state of a system changes.
The total potential energy of the particles.
Define specific latent heat of fusion.
The energy needed to change the state of a system from solid to liquid, per kg.
State the standard units for power.
Watts (W)
Define power in terms of energy.
Rate of transfer of energy.
Define specific latent heat of vaporisation.
The energy needed to change the state of a system between liquid to gas, per kg.
Identify the energy resource that contributes most negatively to climate change.
Fossil fuels.
In symbols, state the equation that link the energy needed for a change of state, mass and specific latent heat.
E = m x L
State the part of the internal energy that changes if the temperature of an object changes.
The total kinetic energy of the particles.
Define renewable energy source.
A resource that is being or can be replenished as it is used.
State the standard units for specific latent heat.
Joules per kg.
Explain the difference between boiling and evaporation.
Boiling happens at the boiling point when all of the substance changes state.
Evaporation happens below it.
Explain why hydroelectricity is considered reliable.
The flow of water through a dam can be adjusted depending on demand.
In terms of energy resources, define reliable.
A resource that can be relied on to supply energy in a predictable way when needed.
Explain why solar power is not reliable in every country.
The amount of sunlight can change due to weather.
State the standard units for work done.
Joules (J)
Describe the relationship between internal energy, total kinetic energy of the particles and total potential energy of the particles.
internal energy = total kinetic energy of the particles + total potential energy of the particles.
Other than climate change, name two important environmental factors when considering which energy source to use.
Destruction of habitats and environmental cost of the building materials.
Name the three types of fossil fuels.
Coal, oil and natural gas.
Name two energy resources which involve burning or combustion.
Fossil fuels and biofuel.
Identify the two main non-renewable energy resources.
Fossil fuels and nuclear fuel.
