Why do longer wires resist more current? Why is copper used everywhere instead of silver? Fourth graders dig into circuit-design thinking here, including how series batteries combine voltage, what a fuse does when too much current flows, and how a dimmer switch changes the brightness of a bulb.
You will read circuit-diagram symbols, learn that rechargeable batteries reverse their chemical reaction to refill, and match voltage, current, resistance, and circuit diagram to clear definitions. These are the core ideas engineers use when designing real devices, and getting them solid now makes middle school electricity feel familiar instead of brand new.
Style:
Electricity and Circuits
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Connecting two batteries end to end in a series increases the total voltage available to the circuit.
2. A longer wire has more resistance than a shorter wire of the same thickness.
3. The symbol for a battery in a circuit diagram shows a long line for positive and a short line for negative.
4. A dimmer switch works by changing the amount of current flowing to a light bulb.
5. Silver is the best conductor of electricity, but copper is used more often because it costs less.
6. A rechargeable battery can reverse its chemical reaction to store energy again.
7. In a circuit diagram, a straight line represents a wire.
8. Electrical resistance is the ability of a material to oppose the flow of current.
9. A fuse is a safety device that contains a thin strip of metal that melts if too much current flows.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
voltage
→ the push that moves electricity through a circuit
drawing that uses symbols to show a circuit
current
→ the flow of electrons through a conductor
the flow of electrons through a conductor
resistance
→ a force that opposes the flow of current
the push that moves electricity through a circuit
circuit diagram
→ drawing that uses symbols to show a circuit
a force that opposes the flow of current
Electricity and Circuits
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) Connecting two batteries end to end in a series increases the total voltage available to the circuit.
2) A longer wire has more resistance than a shorter wire of the same thickness.
3) The symbol for a battery in a circuit diagram shows a long line for positive and a short line for negative.
4) A dimmer switch works by changing the amount of current flowing to a light bulb.
5) Silver is the best conductor of electricity, but copper is used more often because it costs less.
6) A rechargeable battery can reverse its chemical reaction to store energy again.
7) In a circuit diagram, a straight line represents a wire.
8) Electrical resistance is the ability of a material to oppose the flow of current.
9) A fuse is a safety device that contains a thin strip of metal that melts if too much current flows.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
voltage
→ the push that moves electricity through a circuit
drawing that uses symbols to show a circuit
current
→ the flow of electrons through a conductor
the flow of electrons through a conductor
resistance
→ a force that opposes the flow of current
the push that moves electricity through a circuit
circuit diagram
→ drawing that uses symbols to show a circuit
a force that opposes the flow of current
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10 Questions
10-15 minutes
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