Testing electric circuits worksheet - Free Printable

To determine whether the bulbs will light in the given circuits, we need to analyze each circuit based on the principles of electric circuits. Specifically, we need to check if there is a complete path (closed loop) for the current to flow from the positive terminal of the battery through the bulb(s) and back to the negative terminal.

Circuit Analysis

#### Row 1
1. Circuit 1.1:
- A simple circuit with a battery and a bulb connected in series.
- Analysis: The circuit is complete, allowing current to flow through the bulb.
- Answer: Yes

2. Circuit 1.2:
- Two bulbs are connected in parallel, but one bulb is not connected to the battery terminals.
- Analysis: Only the top bulb has a complete path; the bottom bulb does not.
- Answer: No

#### Row 2
3. Circuit 2.1:
- A circuit with a bulb inside a box, but no visible connection to the battery.
- Analysis: There is no connection between the bulb and the battery.
- Answer: No

4. Circuit 2.2:
- A circuit with a bulb and a broken wire (open switch).
- Analysis: The circuit is open due to the broken wire, so no current can flow.
- Answer: No

#### Row 3
5. Circuit 3.1:
- A circuit with a double battery and a bulb.
- Analysis: The circuit is complete, allowing current to flow through the bulb.
- Answer: Yes

6. Circuit 3.2:
- A circuit with just a battery and no bulb or load.
- Analysis: There is no bulb or load in the circuit, so no current flows through a bulb.
- Answer: No

#### Row 4
7. Circuit 4.1:
- A circuit with a bulb and an open switch.
- Analysis: The circuit is open due to the open switch, so no current can flow.
- Answer: No

8. Circuit 4.2:
- A circuit with a bulb and a closed loop of wires.
- Analysis: The bulb is short-circuited because the wires bypass it, and no current flows through the bulb.
- Answer: No

#### Row 5
9. Circuit 5.1:
- A circuit with two bulbs in parallel.
- Analysis: Both bulbs have a complete path, allowing current to flow through each.
- Answer: Yes

10. Circuit 5.2:
- A circuit with two bulbs in series.
- Analysis: The circuit is complete, allowing current to flow through both bulbs.
- Answer: Yes

#### Row 6
11. Circuit 6.1:
- A circuit with a bulb and a closed loop of wires.
- Analysis: The bulb is short-circuited because the wires bypass it, and no current flows through the bulb.
- Answer: No

12. Circuit 6.2:
- A circuit with a bulb and a closed loop of wires.
- Analysis: The bulb is short-circuited because the wires bypass it, and no current flows through the bulb.
- Answer: No

Final Answers

1. Yes
2. No
3. No
4. No
5. Yes
6. No
7. No
8. No
9. Yes
10. Yes
11. No
12. No

Boxed Answer:
\[
\boxed{
\begin{array}{cc}
\text{Yes} & \text{No} \\
\text{No} & \text{No} \\
\text{Yes} & \text{No} \\
\text{No} & \text{No} \\
\text{Yes} & \text{Yes} \\
\text{No} & \text{No} \\
\end{array}
}
\]