Energy

Question 1

What are the different forms of energy?

Answer 1

Kinetic (KE) (movement energy)
Potential - GPE (lifting an object)
               - Strain/elastic (stretching)
Chemical (stored in chemical bonds)
Heat (thermal)
Light
Sound
Electrical
Nuclear (stored in nuclear bonds - released in atomic bombs/nuclear power stations)

Question 2

Energy change concept

Answer 2

In any energy change, you always get some undesirable energy produced (wasted energy). This is usually in the form of heat, light and/or sound. This wasted energy usually dissipates into the atmosphere.
e.g. light bulb
electrical -> light + heat

Question 3

What is the principle of the conservation of energy?

Answer 3

Energy cannot be created or destroyed, but can be changed from one form into another.

Question 4

How does one draw a sankey diagram?

Answer 4

The width of the arrow and height must be to scale to represent the value of the energy.

Question 5

How does one calculate efficiency?

Answer 5

efficiency = (useful energy out/total energy in) x 100

Question 6

How are the particles in ice arranged and what is their movement like?

Answer 6

• Regular pattern (close packed).
• Vibrating in fixed positions.
• Little space in between the particles.

Question 7

How are the particles in water arranged and what is their movement like?

Answer 7

• Irregular pattern.
• Able to move over and past other particles.
• Little space in between the particles.

Question 8

How are the particles in steam arranged and what is their movement like?

Answer 8

• No pattern.
• Able to move freely and fast.
• Large spaces between the particles.