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Series and Parallel Circuits
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Series and Parallel Circuits
📚 Part 1: Concepts (Multiple Choice & Matching)
1. What usually happens when a second identical bulb is added in series with one bulb and one battery?
Both bulbs become brighter
Both bulbs become dimmer
One bulb stays the same and the other becomes brighter
No change
2. What usually happens when a second identical bulb is added in parallel with one bulb and one battery?
Each bulb stays about the same brightness as a single bulb
Each bulb becomes dimmer
Only one bulb will light
Both bulbs become much brighter
3. Check all statements that are true:
In a series circuit the same current flows through every component.
In a series circuit the battery voltage is divided between components.
In a parallel circuit each bulb has its own path to the battery.
Adding more bulbs in series increases the total current.
4. Match the term (left) with the correct description (right). Draw lines between columns.
A. Series
B. Parallel
C. Current
D. Voltage
1. The energy per charge that pushes electrons through a circuit
2. Components connected so there is more than one path for current
3. The flow of electric charge through a circuit
4. Components connected end-to-end so the same current flows through all
✏️ Part 2: Practical — Predictions, Observations and Explanation
5. Prediction (series): I predict that adding another bulb in series will make the first bulb ___________.
6. Prediction (parallel): I predict that adding another bulb in parallel will make the first bulb ___________.
7. Observation: Describe what you observed when you added another bulb in series (brightness, and any other note):
8. Observation: Describe what you observed when you added another bulb in parallel (brightness, and any other note):
9. Were your predictions correct?
Yes — both series and parallel predictions were correct
Partly — one was correct, one was not
No — neither was correct
10. Explain in one or two sentences why adding bulbs in series usually makes them dimmer, while bulbs in parallel usually stay the same brightness.
11. Draw: Sketch a circuit showing two bulbs in parallel connected to a battery. Label the battery, bulbs and show the separate paths.
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