By Patti Richards
Updated Aug 30, 2022
Learning how electricity flows is most effective when students build and experiment with real circuits. By connecting a source of charge, a pathway, and a device, children see how electrons travel and how voltage influences brightness and current.
In this hands‑on activity, students use a simple circuit that includes a battery compartment, a switch, and a light‑bulb socket. They begin with a 1.5‑volt battery, observe the bulb’s brightness, then replace it with a 3‑volt battery and compare results. The exercise demonstrates how higher voltage increases current, making the bulb brighter. Students record observations and draw conclusions in their science journals.
This project recreates the kind of basic circuit Thomas Edison might have used. You’ll need a penlight bulb, a flashlight battery, two 6‑inch lengths of wire, tape, a small flat metal strip, two thumbtacks, and a small block of wood. The wood block serves as a switch: a thumbtack is inserted into the block, the metal strip touches the first tack, and a second tack completes the circuit when the metal strip is pressed. Wire the battery terminals to the thumbtacks, place the bulb in the middle, and tape everything in place. When the metal strip touches the thumbtack, the circuit closes and the bulb lights.
Using two light‑bulb holders, two bulbs, a D‑cell battery with its holder, six insulated wires (25–30 cm each), and a science journal, students explore how circuit configuration affects brightness and reliability. First, create a single‑bulb circuit (Circuit A) with the fewest wires. Next, build a two‑bulb series circuit (Circuit B) and predict what happens when one bulb is removed. After testing, design a parallel arrangement that keeps one bulb lit when the other is taken out (Diagram C). Finally, compare brightness levels in each configuration and document findings.
Students assemble a basic circuit with a half‑meter copper wire cut into three equal segments, a battery, a small flashlight bulb with socket, a switch, electrical tape, and scissors. Strip about 0.5 cm of insulation from each wire end, connect one to the battery’s positive terminal, the other to the bulb’s right side, the third to the battery’s negative terminal and the switch, and the last to the switch’s other side and the bulb’s left side. Observing the circuit’s behavior when the switch opens or closes helps students label each component—source, connecting wires, switch, and device—in their journals and explain their roles.
