Different energy sources are used to generate electricity.

1. (a)(i)Nuclear energy is described as a non-renewable source. Explain what is meant by a non-renewable energy source.[1]
2. (a)(ii)Four of the energy sources used are: hydroelectric oil geothermal wind Write the name of these energy sources in the correct column of the table below. non-renewable | renewable and caused by energy from the Sun | renewable and not caused by energy from the Sun -----------------|-----------------------------------------------------|----------------------------------------------------[3]
3. (a)(iii)State one way in which using nuclear energy is better for the environment than using oil.[1]
4. (a)(iv)State one way in which using nuclear energy is worse for the environment than using oil.[1]
5. (b)(i)Fig. 9.1 is a block diagram of a power station that produces electrical energy from oil. Write the name of the missing part of the power station in the empty box on Fig. 9.1.[1]
6. (b)(ii)State the form of energy that the turbine possesses.[1]
7. (b)(iii)1.A small boiler in the power station contains 24 m³ of water at 30°C. High pressure in the boiler increases the boiling point of water to 120°C. Thermal energy supplied to the boiler is used to heat the water from 30°C to 120°C and then to turn it all to steam at 120°C. The density of water is 1000 kg/m³. The specific heat capacity of water is 4200 J/(kg°C). The specific latent heat of vaporisation of water is 2.3 x 10⁶ J/kg. Calculate the mass of water in the boiler.[1]
8. (b)(iii)2.Calculate the total thermal energy (heat) supplied to the boiler.[4]
9. (b)(iv)The electrical energy output from the power station is transmitted over long distances at a high voltage. Explain why electricity is transmitted at a high voltage.[2]