P2 - Energy Transfer By Heating (PAPER 1)

Question 1

What type of materials are the best conductors

Answer 1

Usually, metals are the best conductors

Question 2

What type of materials are the best insulators

Answer 2

Non-metals are the best insulators

Question 3

How does a material’s thermal conductivity affect the rate of energy transfer through it by conduction

Answer 3

The higher the thermal conductivity, the higher the rate of energy transfer through it

Question 4

How does the material’s thickness affect the rate of energy transfer

Answer 4

The thicker the material, the lower the rate of energy transfer

Question 5

What is the specific heat capacity

Answer 5

The amount of energy needed to change the temperature of 1 kg of the substance by 1*C

Question 6

What is the formula for the amount of energy transferred

Answer 6

Energy transferred (J) = mass (kg) x specific heat capacity (J/kg C) x temperature change (C)

Question 7

How does the mass of the material change how quickly the temperature changes when heated

Answer 7

The greater the mass, the slower the temperature increases when heated

Question 8

What device can be used to find the energy transferred

Answer 8

A joulemeter

Question 9

What are five ways that the rate of energy transfer from a house can be reduced

Answer 9

• loft insulation
• cavity wall insulation
• double - glazed windows
• aluminium foil behind radiators
• thicker exterior walls