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🔌 Building a Simple Circuit

A cell, some wires, and a bulb — join them in a complete loop and the bulb lights up. Learn the parts of a circuit and how to build one that works.

lessons

~15 min

to learn

🔬 Science

subject

Ages 6–12

level

Start the course →

What you’ll learn

The Parts of a CircuitName the parts of a simple circuit — the cell, the wires, and the bulb — and say what each one does.A circuit is a loop that electricity flows around. The cell is the energy source that pushes the electricity, the wires carry it, and the bulb is a component that turns electrical energy into light. Every part has a job to do.
Making a Complete LoopUnderstand that a circuit only works when the loop is complete, and that any gap stops the electricity.Electricity can only flow around a complete loop with no gaps. If a wire comes loose or a part is missing, the loop is broken and the bulb goes dark. A break anywhere stops the electricity everywhere.
Building It YourselfBuild a simple working circuit by connecting a cell, wires, and a bulb into a complete loop.To build a circuit, gather a cell, two wires, and a bulb. Join the cell to the bulb and the bulb back to the cell to close the loop, then check for gaps. With a complete loop, electricity flows and the bulb glows.

Questions this course answers

What is the job of the cell in a circuit?

The cell is the energy source. It pushes the electricity around the loop and powers the circuit.

What is usually inside a wire to carry the electricity?

Wires have metal inside, often copper, because metals let electricity flow through them easily.

What does the bulb do with the electrical energy?

The bulb is a component that turns electrical energy into light as electricity flows through it.

Why does a bulb go dark when one wire comes loose?

A gap anywhere in the loop stops the electricity everywhere, so the bulb cannot light.

For a bulb to light, the circuit must be...

Electricity can only flow when the loop is complete, with every part joined and no gaps.

Which three parts do you need to build a simple circuit that lights a bulb?

A simple circuit needs a cell for energy, wires to carry the electricity, and a bulb to make light.

Grounded in trusted sources

BBC Bitesize
Britannica Kids
The Physics Classroom
Khan Academy

Every Wunder lesson is built from real, reputable sources — never invented.

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