Problem Analysis and Solution
The worksheet provided involves understanding series and parallel circuits, as well as analyzing the behavior of switches and bulbs in these circuits. Let's solve each question step by step.
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Q.1: True or False Statements
1.
Statement 1: In a series circuit, electricity has only one path to follow.
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Explanation: In a series circuit, all components (e.g., bulbs, resistors) are connected end-to-end in a single loop. Current flows through each component sequentially, meaning there is only one path for the current to take.
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Answer:
True (T)
2.
Statement 2: In a parallel circuit, electricity has more than one path to follow.
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Explanation: In a parallel circuit, components are connected in such a way that there are multiple paths for the current to flow. Each branch of the circuit can carry current independently.
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Answer:
True (T)
3.
Statement 3: Electric current can flow through an open circuit.
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Explanation: An open circuit means there is a break in the circuit, preventing the flow of current. Current cannot flow through an open circuit because it requires a complete path to move.
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Answer:
False (F)
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Q.2: Which Switch or Switches Must Be Closed for the Lamps to Light Up?
The circuit diagram shows three switches (Switch 1, Switch 2, and Switch 3) connected in series with two lamps. For the lamps to light up, the circuit must be closed, meaning there should be no breaks in the path of the current.
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Analysis:
- The switches are in series, so all switches must be closed for the current to flow through the entire circuit.
- If any one switch is open, the circuit will be broken, and the lamps will not light up.
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Correct Answer:
d) Switches 1, 2, and 3
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Q.3: Circuit Type and Behavior When Bulb X Is Removed
The second part of the worksheet involves analyzing a circuit with two bulbs, labeled
Bulb X and
Bulb Y.
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Part A: What Kind of Circuit Is Shown Above?
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Diagram Analysis:
- The bulbs are connected in such a way that they are in series. This is evident because the current must pass through both bulbs sequentially before returning to the power source.
- In a series circuit, all components are connected end-to-end, and there is only one path for the current.
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Answer:
a) series
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Part B: If Bulb X Is Removed, What Will Happen to Bulb Y?
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Analysis:
- In a series circuit, removing one component (e.g., Bulb X) breaks the circuit entirely. Since the current cannot flow through a broken circuit, Bulb Y will also stop receiving current.
- Therefore, if Bulb X is removed, Bulb Y will turn off.
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Answer:
c) It will turn off
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Final Answers
1.
Q.1:
- Statement 1:
T
- Statement 2:
T
- Statement 3:
F
2.
Q.2:
d) Switches 1, 2, and 3
3.
Q.3:
- Part A:
a) series
- Part B:
c) It will turn off
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Boxed Final Answers
\[
\boxed{
\begin{array}{l}
\text{Q.1: T, T, F} \\
\text{Q.2: d) Switches 1, 2, and 3} \\
\text{Q.3: a) series, c) It will turn off}
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of series and parallel circuits worksheet answer key.
