The video tutorial explains the importance of u-values in determining the effectiveness of materials as heat insulators, with examples of cavity and stone brick walls. It introduces the concept of specific heat capacity, highlighting its role in energy storage and transfer, particularly in water. The tutorial also provides a formula to calculate the energy required to change the temperature of a substance, using water as an example.

What does a lower u-value indicate about a material's insulating properties?

• It is a poor insulator.

• It is a better insulator.

• It allows more heat to escape.

• It increases energy costs.

Which type of wall has a higher u-value, making it less effective at retaining heat?

• Wooden wall

• Stone brick wall

• Insulated wall

• Cavity wall

What is specific heat capacity?

• The energy needed to freeze 1 kilogram of a substance.

• The energy required to boil 1 liter of water.

• The amount of energy needed to melt 1 kilogram of a substance.

• The amount of energy needed to change the temperature of 1 kilogram of a substance by 1 degree Celsius.

Why is water considered useful for storing and transporting heat?

• It is a poor conductor of heat.

• It has a high specific heat capacity.

• It is easy to freeze.

• It has a low specific heat capacity.

In the formula E = m × c × θ, what does 'c' represent?

• Specific heat capacity

• Energy required

• Change in temperature

• Mass of the substance