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In a national electricity network, which part does the same job as the cell in a simple circuit?
AThe power lines
BThe power station
CThe light bulbs
DThe switches
Answer & Solution
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_