Grade 3 · Science · Lesson 20

Simple Electric Circuits

Electricity flows through a path called a circuit. A simple circuit has four key components: a battery (power source), wires (path), a switch (control), and a bulb (output). For electricity to flow, the circuit must be a complete, unbroken loop — a closed circuit.

What this lesson teaches

1Name the key components of a simple electric circuit
2Explain the role of each component in allowing current to flow
3Distinguish between an open circuit and a closed circuit

Free · 7 days · No credit card

Unlock the full HSEA system for 7 days.

Create a kid profile, open any lesson, save progress — your family uses HSEA exactly the way a paying family does. Cancel anytime. Nothing to set up, no card required.

✓ All 1,680 lessons, Grades 1–6, every subject
✓ Profiles + saved progress for every kid
✓ Final exams + printable certificates

Start your 7-day free trial →

Already convinced? See full membership plans →