NAME:
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.
___________________________________________________________
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.
______________________________________________________________________________________________________________________
___________________________________________________________
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.
______________________________________________________________________________________________________________________
___________________________________________________________
[pic] [pic] [pic]
PART 2 – PARALLEL CIRCUITS
12V DC
+ -
Wire up two globes in parallel. Record the brightness of the two globes.
___________________________________________________________
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.
______________________________________________________________________________________________________________________
___________________________________________________________
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.
______________________________________________________________________________________________________________________
___________________________________________________________
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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