This Grade 3 medium worksheet focuses on open and closed circuits, conductors, and insulators. Students use fill-in-the-blank and matching questions to describe how electricity flows through metals like copper and is stopped by rubber or plastic. The sheet reinforces key Grade 3 science words and shows why a circuit must be complete to work, which supports NGSS 3-PS2-3 and everyday safety around electrical devices.
Style:
Electricity and Magnetism
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A closed circuit has no gaps so electricity flows all the way around.
2. An open circuit has a break, so the bulb will not light.
3. A material that lets electricity flow through it is called a conductor.
4. A material that stops electricity from flowing is called an insulator.
5. A switch can open or close a circuit by pressing or flipping it.
6. Copper is a metal that is a very good conductor of electricity.
7. Wires are usually covered with plastic to act as an insulator.
8. The part of a circuit that gives off light is the bulb.
9. A battery is the power source that pushes electricity around a circuit.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Closed circuit
→ A complete loop where electricity flows
A complete loop where electricity flows
Open circuit
→ A broken path so the bulb stays off
A broken path so the bulb stays off
Conductor
→ Copper wire that carries electricity
Copper wire that carries electricity
Insulator
→ Rubber that stops electricity from passing
Rubber that stops electricity from passing
Electricity and Magnetism
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) A closed circuit has no gaps so electricity flows all the way around.
2) An open circuit has a break, so the bulb will not light.
3) A material that lets electricity flow through it is called a conductor.
4) A material that stops electricity from flowing is called an insulator.
5) A switch can open or close a circuit by pressing or flipping it.
6) Copper is a metal that is a very good conductor of electricity.
7) Wires are usually covered with plastic to act as an insulator.
8) The part of a circuit that gives off light is the bulb.
9) A battery is the power source that pushes electricity around a circuit.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Closed circuit
→ A complete loop where electricity flows
A complete loop where electricity flows
Open circuit
→ A broken path so the bulb stays off
A broken path so the bulb stays off
Conductor
→ Copper wire that carries electricity
Copper wire that carries electricity
Insulator
→ Rubber that stops electricity from passing
Rubber that stops electricity from passing
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
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