Energy

What do you need to burn both food and fuels?

Oxygen.

What do electrical appliances require to function?

An electric current.

How is energy measured?

In joules.

How many joules are in one kilojoule (KJ)?

1000 joules.

What is a fuel?

Something we can burn which releases energy.

List one way the body uses energy from food.

To keep warm.

What happens if you take in more energy than you need?

Your body stores it as fat.

What are the first letters of the different types of energy according to the acronym?

M-K-H-L-G-C-S-E-E-N.

What is kinetic energy?

Energy found in moving objects.

What is elastic potential energy?

Energy found in stretched objects.

What does the law of conservation of energy state?

Energy cannot be created or destroyed, only transferred.

What are the eight main energy stores?

Chemical, Kinetic, Gravitational, Elastic, Thermal, Magnetic, Electrostatic, Nuclear.

What are the six ways energy can be transferred?

Mechanically, Electrically, Heating, Radiation, Light, Sound.

How does heating affect the movement of particles?

It changes their movement.

What is equilibrium in the context of energy transfer?

Where both objects are at the same temperature.

What is conduction?

The transfer of thermal energy through a solid.

How is convection different from conduction?

Convection transfers energy in moving currents (liquids or gases).

What is radiation?

The transfer of energy in the form of waves.

What type of surfaces are the most absorbent and reflective?

Matte black is the most absorbent; white shiny is the most reflective.

What does cavity wall insulation do?

Reduces heat loss by minimizing conduction and preventing convection.

What are fossil fuels formed from?

The remains of dead sea creatures.

Why are fossil fuels considered non-renewable?

They cannot be replaced.

What is renewable energy?

A source that can be used again.

How is power defined?

How fast energy is transferred from one form to another.

What is the power equation?

Power = Energy / Time.

What is work done measured in?

Joules or kilojoules.

What do levers do?

They act as force multipliers.

What happens to the force applied to a lever?

The force applied to the lid is bigger than the force applied with just your hand.