Energy

What is a fuel?

They are stores of energy, they need to be burned in oxygen to trasfer their energy e.g. coal, oil and gas

Name the 9 types of energy and meaning?

• elastic potential energy - energy stored in compressed or twisted objects

• chemical energy- energy stored in fuel due to chemical bonds

• Nuclear energy- the energy stored in the nuclei of atoms

• Thermal energy- energy stored in objects that are responsible for their tempreture

• Light energy- An energy that travels in the form of electromagnetic waves

• electrical energy- energy trasferred from the movement of particles like electrons

• Sound energy- energy stored by vibration of waves

• Gravitational potential energy- energy stored in raised objects

• Kinetic energy- energy stored in moving objects

What is an energy store?

An object that allows you to see the energy at he start and end of the transfer

What is the law of conversion of energy

Energy cannot be created of destroyed it can me transferred from one object to another

energy in = energy out

What is efficiency? How do you calculate it?

How good and appliance is at transferring energy to useful forms. The higher the efficiency the lower fuel wastage

efficiency = useful energy output / total energy output

What is the difference between thermal energy and tempreture?

• thermal energy is the energy stored in an object

• Temperature is a measure of how hot or cold an object is

How is thermal energy and temperature linked?

1. heating object increases kinetic energy of its particles

2. An increase is kinetic energy increases the thermal energy store

3. An increase in thermal energy store increases the temperature

What is Conduction?

The way energy transferred thorough solids. As the particles in the solid are heated, they vibrate more. As the vibration increaces the particles collide more and trasffer their energy to neighboring particles. This continious until thermal equilibrium is reached

What is convection current?

The movement of heated liquids or gases caused by the rise and fall of particles as they heat and cool

Explain convection current

The particles closest to the heat source gain KE causing them to move further away making them less dense and causing them to fall again. This keeps going until thermal equilibrium is reached