Year 9 Science · Unit 3 · Lesson 18

Series and Parallel Circuits

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Learning Goals

Warm Up

Because… chain

Fill in the missing effects. Each cause leads to the next step in the chain.

Australian home lights are wired in parallel
→
Each light globe receives full 240 V
→
One light globe fails (filament breaks)
→
The circuit in other branches is not broken
→

Overall outcome, why parallel wiring is safer and more practical than series wiring:

Your Turn

Real-world context

Australian rooftop solar installations typically wire solar panels in combinations of series and parallel connections, known as series-parallel arrays. A single 400 W panel might produce 40 V and 10 A. To power a 240 V household system, installers connect multiple panels in series to raise the voltage, then connect those series strings in parallel to increase the current available. A typical Australian residential system might use 6.6 kW of panels arranged this way.

(a) Explain why connecting solar panels in series increases the total voltage. Use what you know about how voltage behaves in a series circuit.

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(b) Explain why connecting series strings of panels in parallel increases the total current available. Use what you know about how current behaves in a parallel circuit.

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(c) Explain why a series-parallel array gives both higher voltage AND higher current than a single panel alone. What is the advantage of combining both wiring types in one system?

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Wrap Up

In one sentence, what was the main idea of this lesson?

HSCScience · Year 9 Science · Unit 3 · Lesson 18 · Apply Worksheet