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JCE (Botswana) Energy Transfer in Systems — practice questions

Explore 2 free Energy Transfer in Systems questions in JCE (Botswana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Energy Transfer in Systems questions and exercises with answers

Showing questions 1–2 of 2.

A light bulb turns electrical energy into light and heat. Which output is the wasted one?Read the answer and worked solution →In a national electricity network, which part does the same job as the cell in a simple circuit?Read the answer and worked solution →

Worked practice questions

A light bulb turns electrical energy into light and heat. Which output is the wasted one?

  1. The light
  2. The sound
  3. The heat
  4. The input
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Correct answer: C. The heat

1. A system takes in input energy and gives out output energy. 2. The output we actually want from a bulb is light. 3. The heat it also gives off is not wanted, so it is the wasted output. 4. A bulb makes no sound worth counting, so that option is not an output at all. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Useful and wasted energy_

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In a national electricity network, which part does the same job as the cell in a simple circuit?

  1. The power lines
  2. The power station
  3. The light bulbs
  4. The switches
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Correct answer: B. The power station

1. A simple circuit has three jobs: a source, a conductor and a useful output. 2. In a simple circuit the cell supplies the energy. 3. An electricity network is one very large circuit doing those same three jobs. 4. The power station is where the electricity is generated, so it is the source. 5. The transmission lines carry the electricity, doing the job of the wires. 6. The lamps and appliances in buildings are the useful outputs, like the bulb. 7. Switches only open and close a path, so they never supply energy. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Overview of the national electricity grid_

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