Electricity - Free Printable

It looks like you've uploaded an image of a worksheet titled "Electrical Current" that includes a hands-on experiment involving a simple circuit with a battery, wires, and a light bulb. The goal is to investigate how changing the length of the wire affects the brightness of the bulb, which reflects the current in the circuit.

Since I can't view images directly, I’ll explain the task based on what's typically found in such worksheets and guide you through solving it step by step.

---

🔍 Understanding the Task

The worksheet describes an experiment where:

- A simple electrical circuit is built using a battery, wires, and a light bulb.
- The length of the wire in the circuit is varied (e.g., 10 cm, 20 cm, 30 cm, etc.).
- For each length, students observe and record how bright the bulb is.
- The brightness is used as an indicator of the amount of current flowing in the circuit.

---

🧪 Experiment Goal

To determine how wire length affects electrical current in a circuit.

---

⚙️ Scientific Concept Behind It

- Resistance increases with the length of the wire.
- Longer wires = more resistance → less current → dimmer bulb.
- This is based on Ohm’s Law:
$$
I = \frac{V}{R}
$$
Where:
- $ I $ = current
- $ V $ = voltage (from the battery)
- $ R $ = resistance

If resistance increases due to longer wire, current decreases.

---

✔ How to Complete the Worksheet

#### Step 1: Fill in the Table

Assume the table looks like this:

| Length of wire in circuit | Number of turns to seconds | Observation |
|--------------------------|----------------------------|-------------|
| 10 cm | | |
| 20 cm | | |
| 30 cm | | |
| 40 cm | | |

> Note: "Number of turns to seconds" might be a typo or mislabeling — likely meant to be “Brightness” or “Bulb brightness rating” (e.g., 1–5 scale). Or perhaps it refers to a timer if measuring how long the bulb stays lit, but that’s unusual for this setup.

Let’s assume instead the column should be “Bulb Brightness” (e.g., Very Bright, Bright, Dim, Very Dim).

#### Example Data:

| Length of wire in circuit | Bulb Brightness |
|--------------------------|------------------|
| 10 cm | Very Bright |
| 20 cm | Bright |
| 30 cm | Dim |
| 40 cm | Very Dim |

---

💡 What is your conclusion?

> As the length of the wire increases, the brightness of the bulb decreases. This means that the current in the circuit decreases because longer wires have higher resistance.

---

📌 Final Answer / Conclusion:

> Increasing the length of the wire increases its resistance, which reduces the current in the circuit. As a result, the bulb becomes dimmer. Therefore, there is an inverse relationship between wire length and current.

---

✔ Summary

- Hypothesis: Longer wire → dimmer bulb.
- Observation: Bulb gets dimmer as wire gets longer.
- Conclusion: Wire length affects current due to increased resistance.

---

If you can provide the exact values or clarify the "number of turns to seconds" part (maybe it's a motor-based experiment?), I can refine the explanation further.

Let me know if you'd like help creating a graph or writing a full lab report!