FREE! - KS3 Current Electricity Homework Worksheet / Worksheet - Free Printable

Let’s go through each question step by step.

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1. Draw the correct symbol to represent each of the circuit components listed below.

You need to draw standard electrical symbols:

- a cell: A long line (positive) and a short thick line (negative), side by side → | |
- b lamp: A circle with an “X” inside it → ⭕✕
- c open switch: Two small circles with a gap between them, one connected to a diagonal line that doesn’t touch the other → o / o (with space)
- d ammeter: A circle with the letter “A” inside → ⭕A

*(Note: Since we can’t draw here, you’d sketch these on paper as described.)*

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2a. Describe the current at points X, Y and Z in the circuit.

Looking at the diagram (which shows a simple series circuit with a battery, switch, lamp, and three labeled points X, Y, Z along the wire):

In a series circuit, the current is the same everywhere — because there’s only one path for electricity to flow.

So:
→ Current at X = Current at Y = Current at Z

Answer: The current is the same at all three points.

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2b. What is the name of the electrical component used to measure the current in a circuit?

That’s an ammeter.

It must be placed *in series* with the component you’re measuring.

Answer: Ammeter

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3. Tick one answer to describe the bulb brightness (assuming both bulbs are identical).

The diagram shows two bulbs in series (one after another in the same loop).

When bulbs are in series:
- They share the voltage from the battery.
- Each gets less energy → so they glow dimmer than if alone.
- But since they’re identical, they get equal share → so they have equal brightness.

Correct choice:
✔ A. equal brightness

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4. What would happen to bulb 2 if bulb 1 were out?

Again, this is a series circuit.

If one bulb burns out or is removed, the circuit breaks — no current flows anywhere.

So bulb 2 will also go out.

Answer: Bulb 2 would turn off (or not light up).

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5. Add in this diagram to show where you would place a voltmeter in order to measure the potential difference across the motor in this circuit.

Voltmeters are always connected in parallel across the component you want to measure.

So, draw two wires coming from the voltmeter (circle with “V”) and connect one to each side of the motor.

Motor is shown as a circle with “M” inside.

Place V-meter like this:
```
----[Motor]----
| |
[V] [ ]
|_______________|
```

(Just make sure the voltmeter connects across the motor, not in line with it.)

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6. In each circuit shown below, the ammeter reading is zero; there is no current flowing. Explain why.

First circuit: Battery, switch (open), lamp, ammeter — all in series.

→ Switch is OPEN → circuit is broken → no current → ammeter reads zero.

Second circuit: Same thing — but now the switch is CLOSED? Wait — look again.

Actually, second circuit has a break in the wire near the lamp — maybe a disconnected wire or broken filament?

But based on typical questions: If ammeter reads zero, either:
- Switch is open, OR
- There’s a break in the circuit (like a burnt-out bulb or loose wire)

Assuming first circuit has open switch → explain that.

Second circuit might have a broken connection — perhaps the wire isn’t touching the lamp properly.

But let’s assume both have obvious breaks.

Answer for first: The switch is open, so the circuit is incomplete.

Answer for second: There is a break in the circuit (e.g., wire not connected or bulb blown), so current cannot flow.

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7. Draw a circuit diagram containing the components from the circuits shown above, and include an ammeter to show the complete circuit flow.

We’ll combine what we’ve seen:

Components needed:
- Cell (battery)
- Switch
- Lamp
- Motor (from Q5)
- Ammeter (to measure total current)

All should be in series unless told otherwise.

Draw:

Battery → Switch → Ammeter → Lamp → Motor → back to Battery

Make sure everything is connected in one loop.

Add arrows showing direction of current (optional but helpful).

Label parts clearly.

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Now, since none of the options (ExplainAnswer, TeachTopic, GeneratePractice) are true, we skip those sections.

Final Answer:

1. Symbols:
- Cell: | |
- Lamp: ⭕✕
- Open switch: o / o (gap)
- Ammeter: ⭕A

2a. Current is the same at X, Y, and Z.
2b. Ammeter
3. A. equal brightness
4. Bulb 2 would turn off.
5. Connect voltmeter in parallel across the motor.
6. First circuit: switch is open. Second circuit: break in circuit (e.g., loose wire or broken bulb).
7. Series circuit: Battery → Switch → Ammeter → Lamp → Motor → back to Battery.