Chapter 1: Energy

Question 1

How can energy dissipation be reduced in power stations?

Answer 1

Engineers design the generators so that they waste as little energy as possible via heat and vibrations

Question 2

How can energy dissipation be reduced in cars?

Answer 2

The car is streamlined to reduce air resistance
Moving parts are lubricated with oil to reduce friction
The engines dissipate less energy as heat
Using wheels

Question 3

How can heat dissipation be reduced in the home?

Answer 3

Having the chimney inside the house, meaning thermal energy can be transferred upstairs
Adding thick layers of loft insulation to prevent heat loss through the roof
Double glazing on windows stops heat from diffusing out of the house
Walls built from two layers of brick with airy insulation foam between them

Question 4

What is efficiency?

Answer 4

Ratio of useful output energy transfer to total input energy