Show and describe a labeled plot of relative power density versus wavelength the distribution of radiation of energy to and from the earth.

 (b)  Define the annual capacity factor, C.F., of a plant.

 (c)  A plant with a capacity of 12,000 kW, generates 30 x 106 kWh of electricity a  year, calculate its capacity factor

 (d)  Mention two applications of solar thermal energy and give a brief description of how any one of them may be used to generate electricity

A typical nuclear power plant generates electricity at the rate of 900 MW . The efficiency of transforming thermal energy into electrical energy is and the plant runs at full capacity for 80% of the year. (Nuclear power plants are down about 20 of the time for maintenance and refueling.)

If a coal burning electrical generating plant burns 2 tons of coal to generate 6000 kWh of electricity, calculate the efficiency of the plant as the ratio of electricity output to fuel energy input.

Which of the following statements is true regarding potential energy and kinetic energy?

(a) Water at the top of the dam has potential energy, water falling through a dam has kinetic energy. The moving water performs work by moving the blades of turbines in the dam to generate electricity.

(b) Water gains kinetic energy as it falls through a dam, water uses potential energy as it moves the blades of turbines in the dam to generate electricity.

(c) Water gains potential energy as it falls through a dam, water uses kinetic energy as it moves the blades of turbines in the dam to generate electricity.

(d) Water at the top of the dam has kinetic energy, water falling through dam has potential energy. The moving water performs work by moving the baldes of turbines in the dam to generate electricity.