Energy Stores And Transfers Flashcards
What are energy stores
Energy store refers to a location or system where energy is stored in a specific form. It can’t be created or destroyed
What is kinetic and potential energy
Kinetic energy - is the energy of motion.
Potential energy - is the energy stored within an object due to its position or configuration.
What does power mean
Power is a measure of the rate at which work is done or energy is transferred or converted.
What does efficiency mean
Efficiency is a measure of how well an object converts input energy into useful output energy.
What is conservation of energy
energy can not be created or destroyed, only transfer from 1 object to another
What is thermal conductivity
Describes how efficiently heat is transferred through a material by conduction.
Types of energy resources
Renewable Energy Resources - energy sources that are derived from sources that are naturally replenished on a human timescale and are considered sustainable over the long term. Examples include: Solar, Wind, Hydroelectric, Biomass, Geothermal
Non-Renewable Energy Resources - energy resources are finite and will eventually be depleted over time. Examples include: Fossil fuels, Nuclear
calculate the amount of energy associated with a moving object, a stretched spring and an object raised above ground level.
Moving Object (Kinetic Energy): KE = 1/2 mv^2
where m is mass and v is velocity.
Stretched Spring (Elastic Potential Energy): E = 1/2 kx^2
where k is the spring constant and x is the extension or compression.
Object Raised Above Ground (Gravitational Potential Energy): PE = mgh
where m is mass, g is the acceleration due to gravity, and h is the height above the ground.
What does wasted energy mean
Wasted energy refers to energy that is not usefully transferred or transformed during a process. It often manifests as unwanted forms of energy, such as heat, sound, or light, that do not contribute to the desired outcome.
explain ways of reducing unwanted energy transfers
Insulation: Reducing heat loss in buildings using materials like fiberglass or foam.
Lubrication: Reducing friction in mechanical systems to minimize energy loss as heat.
Streamlining: Reducing air resistance for vehicles and machinery to improve efficiency.
Thermal Barriers: Using reflective coatings to reduce heat transfer.
describe how the rate of cooling of a building is affected by the thickness and thermal conductivity of its walls.
Thickness of Walls: Thicker walls provide better insulation and reduce the rate of heat transfer, slowing down the rate of cooling.
Thermal Conductivity: Materials with low thermal conductivity are better insulators. Using such materials for walls will reduce heat loss and slow the rate of cooling.
