An electric motor is being used to raise a load. Fig. 4.1 shows the energy transfer involved. The diagram gives energy input to motor 100 J, work done in lifting load 80 J, and waste energy 20 J.
(a(i))[1]
State the term used for the energy gained by the load because its height increases.
(a(ii))[1]
What effect does the waste energy from the motor have on the surroundings?
(a(iii))[2]
State the principle of conservation of energy and explain how it applies to the motor’s operation. Use information from Fig. 4.1 in your answer.
(b)[4]
State two advantages of coal-fired power stations and state two problems caused by their use.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “(gravitational) potential energy” …