Question

Hi please show the method and all explanations.

Will rate!

You need 200Wh (0.2 kWh) of electrical energy to boil 2 litres of water in a 2 kW kettle. 5,6 kg of coal has an equivalent calorific value of 1 kWh. If the efficiency of a coal-fired power station is 30% and average losses in the combined transmission and distribution system is 10%;

a) How much coal is burnt at the power station to provide 200Wh of electrical energy at home for boiling 2 litres of water in the kettle?

b) A coal-fired power station reported emitting 211,1Mt of CO2 from burning 113, 7Mt of coal in the power stations.

i. How much CO2 is emitted into the atmosphere at the power station in providing the electrical energy to boil the 2 litres of water in the electric kettle?

Answer 1

We calculate out the coal required for producing the 200Wh energy at the output end from multiplying efficiencies with calorific value and Co2 produced was also calculated with the help of data provided.