Questions on Energy Transitions
Q1. The drawings below show what happens to the energy supplied to four appliances.
(a)
(i) What percentage of energy of the light bulb is given out as light? Write your answer on the line by the light bulb.
5%
1 mark
(ii) What percentage of energy is wasted by the mixer? Write your answer in the box by the mixer.
60%
1 mark
(iii) Complete the sentence below.
| Parts of the mixer become hot because some of the electrical energy is changed into ........thermal (or heat) .............. energy which is wasted. |
1 mark
(b) Energy is wasted as sound in many appliances. Which appliance in the drawings produces sound which is not wasted?
The radio
1 mark
(c) In which of the appliances is the highest percentage of energy wasted?
The light bulb
1 mark
Maximum 5 marks
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