Fourth Grade · Science · week 6

Electric current basics

Describe a simple circuit as a complete pathway that lets electrical energy flow from a source to a device, and explain that a break stops the flow.

Electricity is another form of energy, and it needs a complete, unbroken path, called a circuit, to flow. A basic circuit has a source of electrical energy, like a battery, a device that uses the energy, like a small bulb or buzzer, and wires connecting them in a loop with no gaps.

If the loop is broken anywhere, even in one tiny spot, the whole circuit stops working. That is exactly how a light switch works: flipping the switch opens or closes a small gap in the loop, letting you turn the flow of electrical energy on and off on purpose.

📋 For the teacher
Teach it (10–15 min):
  • If you have a simple battery-and-bulb kit, build a working circuit together and then deliberately disconnect one wire to show the bulb go dark.
  • If you do not have a kit, describe a flashlight instead: batteries, a bulb, and a switch that opens or closes the loop when pressed.
  • Have your child trace the loop with a finger, source to device and back, to feel the idea of a complete path.
  • Ask them to predict, before you try it, whether disconnecting a particular wire will stop the bulb, then test the prediction.
Talk about it:
  • What are the three parts a simple circuit needs?
  • What happens to the flow of electrical energy when the loop is broken?
  • What is a switch actually doing to the circuit when you turn something off?

Mastery looks like: They can describe a simple circuit as a complete loop connecting a source and a device, and explain why any break in the loop stops the flow.

Common stumbles: Thinking a wire connected to only the battery, with no complete loop back, should still light a bulb; not recognizing a switch as simply an intentional gap in the circuit.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
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