Review circuits-vocabulary-simple circuits worksheet - Free Printable

Let's solve Exercise 1 from the worksheet titled *"Simple Circuit"*. The goal is to determine whether the light bulb(s) will light or will not light based on the circuit configuration.

We need to analyze each of the four circuits (numbered 1, 2, 5, and 6). Remember:

- A complete circuit must have:
- A power source (battery),
- Conducting wires,
- A load (bulb),
- And a closed path (no breaks).
- If there’s a break in the circuit (e.g., an open switch, broken wire, or disconnected component), the bulb won’t light.
- If the circuit is complete, the bulb will light.

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🔧 Let's go through each one:

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#### 1.
- Battery: Connected.
- Two bulbs: One is connected in the loop, but the second bulb has a broken wire — it’s not properly connected.
- Wait: Look closely — the wire from the battery goes to the first bulb, then to the second bulb, but the second bulb has no wire going back to the battery.
- Actually, let's trace:
- From + terminal → wire → first bulb → wire → second bulb → but then no return path to the negative terminal.
- The second bulb is connected, but the wire ends at the second bulb — no complete loop.
- Also, the negative terminal is not connected to anything after the first bulb?
- No — wait: There’s a wire from the second bulb that goes nowhere.
- But also, the first bulb is connected to the battery, but the second bulb is in series, but the return wire from the second bulb does not connect back to the battery’s negative.
- Actually, the wire from the second bulb goes to the base of the first bulb, which is already connected — this might be a short or misconnection.

Wait — looking carefully:

- Wire from + → first bulb → second bulb → then wire back to the negative terminal? Let's check.

No — the wire from the second bulb goes to the base of the first bulb, which is already connected to the positive side via the wire.

This creates a short circuit or a loop without proper return.

But more importantly: Is there a complete path?

Let’s retrace:

- Start at + → wire → first bulb → wire → second bulb → wire → back to negative terminal?

Yes! Wait — the wire from the second bulb does go back to the negative terminal.

Actually, yes: In diagram 1:

- From + → first bulb → second bulb → wire back to –.

So both bulbs are in series, and the circuit is complete.

✔ Answer: Will light — both bulbs will light.

But wait — look at the first bulb: Is it connected properly?

The wire from the battery goes to the top of the first bulb, then the bottom of the first bulb connects to the top of the second bulb, and the bottom of the second bulb connects back to the – of the battery.

So yes — complete series circuit.

✔ Answer for #1: Will light

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#### 2.
- Battery: Connected.
- One bulb.
- Wire from + → bulb → then wire back to –.
- The wire is continuous and unbroken.

✔ This is a complete circuit.

➡️ Answer: Will light

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#### 5.
- Battery: Connected.
- Two bulbs.
- Wire from + → first bulb → then to second bulb → then back to –.
- So again, series circuit, both bulbs in line, full loop.

✔ Answer: Will light

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#### 6.
- Battery: Connected.
- Two bulbs.
- Wire from + → splits into two paths: one to first bulb, one to second bulb.
- Then both bulbs connect back to – via separate wires.

This is a parallel circuit.

- Both bulbs have their own path from + to –.
- So even if one bulb fails, the other can still work.

✔ Answer: Will light — both bulbs will light.

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Wait — but let's double-check the wiring.

In diagram 6:
- From + → wire splits: one goes to top of first bulb, another to top of second bulb.
- Bottom of first bulb → wire → back to –.
- Bottom of second bulb → wire → back to –.

Yes — parallel circuit, both bulbs have complete paths.

✔ Will light

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✔ Final Answers:

1. Will light
2. Will light
5. Will light
6. Will light

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📌 Explanation Summary:

All four circuits show complete paths from the battery’s positive terminal, through the bulb(s), and back to the negative terminal. There are no breaks or switches in the open position. Even though some circuits use series or parallel connections, as long as the path is complete, the bulbs will light.

Only if there were:
- A switch open,
- A broken wire,
- Or a disconnected bulb,

…would the bulb not light.

But in these diagrams, all circuits are closed and complete.

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✔ Final Answer Key:

1. Will light
2. Will light
5. Will light
6. Will light

Let me know if you'd like a visual explanation or a drawing guide!