1.1. Figure 2 shows some solar panels on the roof of a house.

Figure 2

The amount of solar energy hitting the solar panels in one day is equal to 700kWh. 

The amount of energy the solar panels generate is 175 kWh.

The kWh is a unit of energy.

Calculate the efficiency of the solar panels.

1.2. In 2010 the UK government passed legislation to encourage people to put solar photovoltaic panels on the roof of their houses.

A photovoltaic panel generates electrical energy.

Suggest why the government wanted people to use solar power rather than fossil fuels.

1.3. State the energy transfer taking place in a solar panel.

1.4. Suggest reasons why solar power alone is unlikely to totally replace fossil fuels as a means of generating electrical energy.

1.5. The UK government has also made money available to help to build houses that are well insulated.

Describe the features of the walls of a building that cools down very slowly.