Make an electric circuit
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Learning Objectives
- 1Describe what an electric circuit is and what makes it complete
- 2Identify the main components of a circuit: battery, wire, bulb, and switch
- 3Distinguish between conductors and insulators
- 4Compare open and closed circuits
- 5Explain the difference between series and parallel circuits
Mini Lesson
An electric circuit is a closed path through which electric current flows. For a circuit to work, there must be a complete, unbroken path from the energy source and back again. In this project lesson you will review how circuits work, the parts that make them up, and the difference between series and parallel connections.
What Makes a Working Circuit
- A power source (battery) provides the electrical energy that pushes current around the circuit.
- Connecting wires carry the current from one component to the next.
- A load (such as a light bulb) uses the electrical energy to do work — in this case, produce light.
- A switch controls whether the circuit is open (current stops) or closed (current flows).
- All components must be connected in a complete loop for current to flow.
Circuit Components and Their Roles
- Battery — stores chemical energy and converts it to electrical energy; has a positive (+) and negative (-) terminal.
- Wire — a conductor that carries current between components.
- Bulb (lamp) — a load that converts electrical energy into light and heat.
- Switch — opens or closes the circuit; an open switch breaks the path and stops current flow.
Conductors and Insulators
- Conductors are materials that allow electric current to flow easily through them. Examples: copper, aluminum, steel, water.
- Insulators are materials that resist the flow of electric current. Examples: rubber, plastic, glass, wood.
- Wires are made of a conductor (copper) coated with an insulator (plastic) for safety.
Open and Closed Circuits
- Closed circuit — the path is complete; current flows and the bulb lights up.
- Open circuit — the path is broken (e.g. a switch is off); current cannot flow and the bulb is off.
Series and Parallel Circuits
- Series circuit — all components are connected in one single loop. If one bulb breaks, the whole circuit stops.
- Parallel circuit — components are connected in separate branches. If one bulb breaks, the others stay on.
- Homes use parallel circuits so that lights and appliances work independently.
Tip: remember C-W-B-S — Circuit, Wire, Bulb, Switch — the four key parts every basic circuit needs.
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