Question
(a) Use words from the box to answer the questions below. chemical & electrical & gravitational potential kinetic & light & sound & thermal (i) What is the useful energy transfer when coal is burnt? qquad energy is transferred to qquad energy (ii) Some of the energy stored in coal is wasted when it is burnt. Give the name of one type of energy released that is not useful. qquad
Answer
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Stuart
Master · Tutor for 5 years
Answer
(i) chemical to thermal(ii) sound or light
Explanation
The question is about energy transformation. When coal is burnt, it undergoes a chemical reaction that releases energy. This energy is then used to heat water and produce steam, which turns a turbine and generates electricity. This process involves several energy transfers. The useful energy transfer in this case is from chemical energy (stored in the coal) to thermal energy (used to heat the water). However, not all the energy released when coal is burnt is useful. Some of it is wasted as sound or light energy.