Energy transfers – practice for Years 8–9

Sample questions on Energy transfers with the right answer and a worked solution, from easy to hard. In the Pickles Academy app a child gets new questions of the same kind every time, so they can't just learn the answers by heart.

Subject

Physics

Year

Years 8–9

Curriculum area

Energy

Question types: How energy changes

Sample questions

1. Question 1 Easy

   What is the main energy change in each device? Match each item (1–3) with the right option (A–D).

   1. electric motor
   2. battery in use
   3. microphone

   • A) sound → electrical
   • B) chemical → electrical
   • C) light → electrical
   • D) electrical → kinetic
   Show the solution

   Answer:

   1. electric motor → D) electrical → kinetic
   2. battery in use → B) chemical → electrical
   3. microphone → A) sound → electrical

   How it works: electric motor – electrical → kinetic; battery in use – chemical → electrical; microphone – sound → electrical

2. Question 2 Normal

   What is the main energy change in each device? Match each item (1–4) with the right option (A–E).

   1. solar panel
   2. microphone
   3. bicycle dynamo
   4. gas cooker

   • A) sound → electrical
   • B) chemical → thermal
   • C) electrical → thermal
   • D) light → electrical
   • E) kinetic → electrical
   Show the solution

   Answer:

   1. solar panel → D) light → electrical
   2. microphone → A) sound → electrical
   3. bicycle dynamo → E) kinetic → electrical
   4. gas cooker → B) chemical → thermal

   How it works: solar panel – light → electrical; microphone – sound → electrical; bicycle dynamo – kinetic → electrical; gas cooker – chemical → thermal

3. Question 3 Hard

   What is the main energy change in each device? Match each item (1–5) with the right option (A–F).

   1. light bulb
   2. solar panel
   3. electric kettle
   4. loudspeaker
   5. gas cooker

   • A) light → electrical
   • B) chemical → thermal
   • C) chemical → electrical
   • D) electrical → light
   • E) electrical → thermal
   • F) electrical → sound
   Show the solution

   Answer:

   1. light bulb → D) electrical → light
   2. solar panel → A) light → electrical
   3. electric kettle → E) electrical → thermal
   4. loudspeaker → F) electrical → sound
   5. gas cooker → B) chemical → thermal

   How it works: light bulb – electrical → light; solar panel – light → electrical; electric kettle – electrical → thermal; loudspeaker – electrical → sound; gas cooker – chemical → thermal

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