This Grade 3 medium worksheet reviews the parts of a simple circuit, including batteries, wires, bulbs, and switches. Students complete fill-in-the-blank statements and match each part to its job. The questions link Grade 3 vocabulary to real uses, such as flipping a switch at home or replacing a battery. The activities strengthen understanding of how each piece works together in a closed loop to light a bulb.
Style:
Electricity and Magnetism
Part A: Fill in the Blank
Write the missing word or number on each line.
1. In a simple circuit, the battery is the source of electrical energy.
2. Electricity moves from the battery through the wires to the bulb.
3. When you flip a switch off, the circuit becomes open and the bulb goes dark.
4. A bulb lights up because electrical energy changes into light and heat.
5. If any wire in a circuit is broken, the circuit is open.
6. A metal paper clip can close a broken circuit because metal is a good conductor.
7. A rubber eraser in a circuit would act like an insulator and stop the flow.
8. A circuit with a battery, wire, and bulb all connected is a closed circuit.
9. The plastic around a wire is there to keep you safe because it is an insulator.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Battery
→ Source of electrical energy in a circuit
Source of electrical energy in a circuit
Wire
→ Thin metal path that carries electricity
Thin metal path that carries electricity
Bulb
→ Part that changes electricity into light
Part that changes electricity into light
Switch
→ Control that opens or closes a circuit
Control that opens or closes a circuit
Electricity and Magnetism
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) In a simple circuit, the battery is the source of electrical energy.
2) Electricity moves from the battery through the wires to the bulb.
3) When you flip a switch off, the circuit becomes open and the bulb goes dark.
4) A bulb lights up because electrical energy changes into light and heat.
5) If any wire in a circuit is broken, the circuit is open.
6) A metal paper clip can close a broken circuit because metal is a good conductor.
7) A rubber eraser in a circuit would act like an insulator and stop the flow.
8) A circuit with a battery, wire, and bulb all connected is a closed circuit.
9) The plastic around a wire is there to keep you safe because it is an insulator.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Battery
→ Source of electrical energy in a circuit
Source of electrical energy in a circuit
Wire
→ Thin metal path that carries electricity
Thin metal path that carries electricity
Bulb
→ Part that changes electricity into light
Part that changes electricity into light
Switch
→ Control that opens or closes a circuit
Control that opens or closes a circuit
Ready to Practice?
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10 Questions
10-15 minutes
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