Drawing circuits for Kids | Physics Lessons for kids | Primary Science - Free Printable

To solve this problem, we need to look at the six circuit diagrams and determine which ones represent a complete, closed circuit where current can flow.

A circuit is "closed" (or complete) if:
1. There is a power source (battery).
2. There is a path for electricity to flow from one side of the battery to the other.
3. The path is not broken by an open switch or a gap in the wire.
4. All components are connected properly in a loop.

Let’s analyze each diagram one by one:

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Top Left:
- Battery ✔️
- Light bulb ✔️
- Switch — but it’s open ✘ → No current flows. Not a working circuit.

Top Right:
- Battery ✔️
- Light bulb ✔️
- Two small circles on the right — these look like terminals or connection points, but there’s no switch or break. Actually, looking closely, those two dots might represent a closed switch (if they’re touching) or just connectors. But in standard notation, if two dots are shown with a line between them, it’s closed. Here, they are drawn as separate dots vertically aligned — likely representing an open switch or incomplete connection. Wait — actually, in many textbooks, two small circles with no line between them mean an open switch. So this is probably not closed. Let’s hold that thought.

Wait — let me re-express: In schematic diagrams, a switch is often drawn as a line with a gap and two dots. If the line connects the dots, it’s closed; if not, it’s open.

In Top Right: The two dots are present, but there’s no line connecting them — so it’s an open switch → Circuit is broken ✘

But wait — maybe those aren’t switches? Maybe they’re just terminals? That would be unusual. Let’s compare with others.

Actually, looking again — in Bottom Right, we have a motor (M), and in Middle Right, we have two bulbs and two dots — same style.

Perhaps the two dots represent a switch that is closed? But in standard drawing, if it’s closed, you’d see a line bridging them. Since there’s no line, it’s likely open.

Alternatively — maybe the two dots are meant to be connected wires? That doesn’t make sense.

Let’s look at Middle Left:
- Battery ✔️
- Two bulbs in series ✔️
- No switch — just a continuous loop ✔️ → This is a closed circuit! Current can flow. ✔

Middle Right:
- Two bulbs ✔️
- Two dots on the right — again, no line between them → likely open switch
Also, note: no battery! ⚠️ Big problem. Without a power source, even if the switch were closed, no current flows. So definitely not a working circuit.

Bottom Left:
- Two batteries in series ✔️
- One bulb ✔️
- Continuous loop, no switch → Closed circuit ✔

Bottom Right:
- Two batteries ✔️
- One bulb ✔️
- One motor (M) ✔️
- All connected in a loop, no switch → Closed circuit ✔

Now back to Top Right: Still ambiguous. But since there’s no battery symbol missing, and the two dots — if we assume they are meant to be a closed switch (maybe the line is implied?), then it could work. But in strict schematic rules, if there’s no line, it’s open.

However, comparing to Top Left, which clearly has an open switch (drawn as a lever not touching), the Top Right uses two dots — which may indicate a different type of switch or connector.

Wait — perhaps the two dots in Top Right and Middle Right are meant to be jumpers or closed connections? That would be non-standard.

Another approach: Let’s count how many circuits have both a power source AND a complete unbroken path.

- Top Left: Has battery, but switch open → ✘
- Top Right: Has battery, but if two dots = open switch → ✘; if closed → ✔. But without a line, safest to say ✘.
- Middle Left: Battery + two bulbs + full loop → ✔
- Middle Right: NO BATTERY → ✘ (even if switch were closed)
- Bottom Left: Two batteries + bulb + full loop → ✔
- Bottom Right: Two batteries + bulb + motor + full loop → ✔

So clearly working: Middle Left, Bottom Left, Bottom Right → 3 circuits.

What about Top Right? Let’s check common textbook conventions.

In some simplified diagrams, two dots with no line might still imply a connection — but that’s rare. More commonly, if it’s a switch, it’s drawn with a gap.

Looking at Top Left: switch is drawn as a diagonal line not touching — classic open switch.

Top Right: two vertical dots — possibly representing a push-button switch that is normally open? Or maybe it’s a mistake?

But here’s a key insight: In Middle Right, there are also two dots — and no battery. So if we interpret the two dots as a switch, then Middle Right has no power → invalid.

Similarly, Top Right has power, but if switch is open → invalid.

Therefore, only three circuits are fully functional:

✔ Middle Left
✔ Bottom Left
✔ Bottom Right

That’s 3.

But wait — what if in Top Right, the two dots are meant to be wires connected? Then it would be closed. But why draw them as dots instead of a straight line? Probably to indicate a switch.

Given that, and to be consistent, I think the intended answer is that three circuits are complete.

Let me double-check Bottom Right: It has two batteries, a bulb, and a motor — all in series. Yes, that’s fine. Motors are loads too. So current flows through all.

Middle Left: Two bulbs in series with battery — yes.

Bottom Left: One bulb with two batteries — yes.

Top Right: If we assume the two dots are a closed switch, then it would work — but visually, it’s not drawn as closed. In contrast, if it were closed, it should have a line. Since it doesn’t, we must assume it’s open.

Thus, final count: 3

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Final Answer:
3