PD2 Practice Questions 2

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# PD2 Practice Questions 2 - PowerPoint PPT Presentation

PD2 Practice Questions 2. Steve has insulated parts of his house. His heating bills are lower. (a) Calculate the cost of Steve’s heating bill. [1] (b) Steve’s double glazing has an air gap between the two pieces of glass.

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## PD2 Practice Questions 2

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### PD2 Practice Questions 2

(a) Calculate the cost of Steve’s heating bill.

[1]

(b) Steve’s double glazing has an air gap between the two pieces of glass.

Why is air important for this way of saving energy?

[1]

(c) Steve put double glazing in his house to reduce his heating bills.

Write about some other ways he could insulate his house.

[3]

(d) It cost Steve £10 000 to fit double glazing.

The double glazing cost saves £50 each year in energy costs.

Calculate the pay back time for fitting double glazing.

[1]

Don puts a pan of milk on the cooker

The pan is made of metal.

Energy is transferred by conduction through the bottom of the pan to the milk.

[3]

(b) Don leaves the pan of hot milk on a table.

What will happen to the temperature of the milk?

[1]

(c)Don cooks jacket potatoes in the oven.

He takes them out of the oven and wraps them in shiny aluminium foil.

The foil keeps them hot for a long time. Explain how.

[2]