Series And Parallel Circuits Worksheet Grade 8

The Great Dome Blackout

Leo Martinez loved two things: his video games and the massive, glowing Bio-Dome in his backyard. The Dome was his science fair project—a mini ecosystem powered entirely by circuits he had built. It had lights for the plants, a tiny water pump for the stream, and a buzzing bee-bot that pollinated the fake flowers.

If one bulb burns out in a parallel circuit, the other bulbs remain lit because current can still flow through the other ____________________. series and parallel circuits worksheet grade 8

Section 3: Real-World Reasoning

Match the scenario to the circuit type.

Bonus (Optional – 2 marks)

A circuit has two identical bulbs in parallel. One bulb burns out (breaks). Will the remaining bulb be brighter, dimmer, or the same as before? Explain. The Great Dome Blackout Leo Martinez loved two

Answer key (concise)

1. Provide labels: (S,P,S,P,S,P) — adapt to provided diagrams.
2. Series: two bulbs on single loop; current I same through both.
3. Parallel: two branches each with one bulb; currents I1 and I2; total I = I1 + I2.
4. All bulbs go out or get much dimmer (depending on open/removed): in series, removing one breaks circuit so others go out.
5. Others stay the same brightness because each branch has full voltage.
6. Brightness increases (current through each bulb increases) — in series both bulbs get brighter but relative distribution same.
7. Brightness of each bulb increases (each branch gets higher voltage).
8. Series has larger resistance; series is 2× the resistance of a single bulb; parallel is 1/2 for two identical bulbs.
9. Req = 2R.
10. Because each appliance gets full voltage and one failing light won't turn off others.
11. The two parallel bulbs share the same voltage and will be brighter than the single series bulb (which sees reduced current); label I_total splitting into I_branch and I_single.