Thermal energy

Question 1

Specific Heat Capacity

Definition

Answer 1

The specific heat capacity of a substance is the amount of energy needed to raise the temperature of 1kg by 1ºC

Question 2

Specific Heat Capacity

Equation

Answer 2

Energy transferred(j) = mass(kg) x Specific heat capacity(J/k ºC) x Temperature change (ºC)

Question 3

Specific Heat Capacity

Symbol Equation

Answer 3

ðe = m x c x ðŧ

Question 4

Specific Latent Heat of Vaporisation

Definition

Answer 4

The amount of energy required to change a substance between a liquid and a gas without changing its temperature

Question 5

Specific Latent Heat of Fusion

Definition

Answer 5

The amount of energy required to change a substance between a solid and a liquid without changing its temperature

Question 6

Specific Latent Heat

Equation

Answer 6

Energy(j) = mass(kg) x Specific Latent Heat(J/Kg)

Question 7

Effective Insulation

Answer 7

1. Insulator should have lowest thermal conductivity possible
2. Insulating layer should be as thick as possible

Question 8

Home Methods of Insulation

Answer 8

• Loft Insulation
• Cavity Wall Insulation
• Aliminium foil behind radiators
• Double glazed windows
• Thick outer walls

Question 9

Cavity walls

Answer 9

A gap between two brick walls that make up the outside of the house. Gap is filled with insulator e.g fiberglass. Tiny gaps mean energy has to transfer by conduction and convection