Y8 Energy
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15 Terms
What is energy?
Energy is a concept that allows mechanical work to be done; it cannot be created or destroyed and exists only as a measurable quantity.
What are the two main types of energy?
Kinetic energy (vibration of particles)
Potential energy (stored energy that has the potential to be used).
What is the unit of measurement for energy?
Energy is measured in Joules (J).
What does ΔE represent?
ΔE represents the change in energy.
What is energy conservation?
Energy conservation is the fundamental law that states energy cannot be created or destroyed, only transferred.
What is energy conversion?
Energy conversion is the process in which energy is transformed from one form to another, resulting in work being done.
What is energy efficiency?
Energy efficiency is a measure of how effectively a device transfers an energy input into a useful energy output.
What is the equation for efficiency?
Efficiency (η) = (useful energy output / total energy input) x 100%.
What is a Sankey diagram?
A Sankey diagram is a scaled arrow diagram that visually represents energy inputs and outputs, where the width of the arrows indicates the proportion of energy.
What is work done in physics?
Work done is the energy transferred when a force causes an object to move a certain distance in the direction of the force.
What is the equation for work done?
Work done = Force x distance.
What determines thermal energy?
Thermal energy is the total energy of the particles in an object, while temperature is the average kinetic energy of those particles.
How does heating affect particles in solids and liquids?
Heating increases the vibration of particles in solids and liquids, raising their kinetic energy.
How do temperature and thermal energy differ?
Temperature measures the average kinetic energy of particles, while thermal energy measures the total energy of all particles.
What happens to kinetic energy when particles speed up?
When particles speed up, their kinetic energy increases, which raises the temperature of the substance.
