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NAME: _____________________________________ DATE: _____________

year 8 science experiment

series & parallel circuits

PART 1 – SERIES CIRCUITS

12V DC

+ -

Power supply

Switch (open) Wires

Globes

Wire up two globes in series. Record the brightness of the two globes.

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Add a third globe to your series circuit. How does the brightness compare to the first experiment when the extra globe is added in? Explain your observations.

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Unscrew one of the globes and observe what happens to the remaining globes. Repeat with each of the other two globes. Record your results and explain why you think what you observed happened.

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[pic] [pic] [pic]

PART 2 – PARALLEL CIRCUITS

12V DC

+ -

Wire up two globes in parallel. Record the brightness of the two globes.

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Add a third globe to your parallel circuit. How does the brightness compare to the first experiment when the extra globe is added in? Explain your observations.

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Unscrew one of the globes and observe what happens to the remaining globes. Repeat with each of the other two globes. Record your results and explain why you think what you observed happened.

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Based on the results of your experiments, do you think our houses are wired in series or parallel? Give two reasons for your answer.

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In a series circuit, the electric current is made to pass through every globe, one after the other.

In a parallel circuit, the electric current splits up and portions go through each globe.

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