Series and parallel circuit 2 worksheet - Free Printable

To determine whether each bulb in the given circuits is glowing or not, we need to analyze the circuit diagrams step by step. The key points to consider are:

1. Current Flow: Current must flow through a bulb for it to glow.
2. Closed Circuit: A closed circuit (path from the positive terminal of the battery to the negative terminal) is required for current to flow.
3. Switches: Open switches break the circuit, preventing current flow.
4. Parallel and Series Connections:
- In a series connection, all components are in a single path.
- In a parallel connection, there are multiple paths for current to flow.

Let's analyze each circuit one by one:

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Circuit 1 (Top Left)

- Description: Two bulbs in parallel with switches.
- Analysis:
- Both switches are open.
- Since both switches are open, no current can flow through either bulb.
- Result: Both bulbs are off.

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Circuit 2 (Top Middle)

- Description: Two bulbs in series with a switch.
- Analysis:
- The switch is open.
- An open switch breaks the circuit, preventing current flow through both bulbs.
- Result: Both bulbs are off.

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Circuit 3 (Top Right)

- Description: Three bulbs in a complex configuration with switches labeled A, B, and C.
- Analysis:
- Switch A is closed, allowing current to flow through the top bulb.
- Switch B is open, breaking the path for the middle bulb.
- Switch C is closed, allowing current to flow through the bottom bulb.
- Result: Top bulb is on, middle bulb is off, bottom bulb is on.

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Circuit 4 (Middle Left)

- Description: Two bulbs in series with a switch.
- Analysis:
- The switch is closed.
- Current flows through both bulbs in series.
- Result: Both bulbs are on.

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Circuit 5 (Middle Middle)

- Description: Three bulbs in a complex configuration with a switch labeled S.
- Analysis:
- Switch S is open.
- An open switch breaks the circuit, preventing current flow through any bulb.
- Result: All three bulbs are off.

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Circuit 6 (Middle Right)

- Description: Three bulbs in parallel with individual switches.
- Analysis:
- All switches are open.
- Since all switches are open, no current can flow through any bulb.
- Result: All three bulbs are off.

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Circuit 7 (Bottom Left)

- Description: Two bulbs in series with a switch.
- Analysis:
- The switch is closed.
- Current flows through both bulbs in series.
- Result: Both bulbs are on.

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Circuit 8 (Bottom Middle)

- Description: Three bulbs in parallel with individual switches.
- Analysis:
- All switches are open.
- Since all switches are open, no current can flow through any bulb.
- Result: All three bulbs are off.

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Circuit 9 (Bottom Right)

- Description: Two bulbs in parallel with a switch.
- Analysis:
- The switch is closed.
- Current flows through both bulbs in parallel.
- Result: Both bulbs are on.

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Final Results

1. Top Left: Both bulbs are off.
2. Top Middle: Both bulbs are off.
3. Top Right: Top bulb is on, middle bulb is off, bottom bulb is on.
4. Middle Left: Both bulbs are on.
5. Middle Middle: All three bulbs are off.
6. Middle Right: All three bulbs are off.
7. Bottom Left: Both bulbs are on.
8. Bottom Middle: All three bulbs are off.
9. Bottom Right: Both bulbs are on.

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Final Answer

\[
\boxed{
\begin{array}{c}
\text{Top Left: off, off} \\
\text{Top Middle: off, off} \\
\text{Top Right: on, off, on} \\
\text{Middle Left: on, on} \\
\text{Middle Middle: off, off, off} \\
\text{Middle Right: off, off, off} \\
\text{Bottom Left: on, on} \\
\text{Bottom Middle: off, off, off} \\
\text{Bottom Right: on, on}
\end{array}
}
\]