Here’s the solution to the science worksheet questions, explained clearly for Stage 4 (typically upper elementary/middle school level):
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Q1a - What happens to the bulb if we turn the switch on?
✔ Answer:
The bulb lights up (or turns on).
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Explanation:
When you turn the switch “on,” it closes the circuit. This means there is a complete, unbroken path for electricity to flow from the battery, through the wires and the bulb, and back to the battery. The electric current heats up the filament inside the bulb, causing it to glow — that’s why the bulb lights up.
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Q1b - In which circuit can electricity NOT flow? Explain why.
✔ Answer:
Electricity cannot flow in the
Open Circuit.
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Explanation:
In an open circuit, the switch is turned “off” or not connected. This creates a gap or break in the path of the circuit. Electricity needs a continuous loop to travel — if there’s a break (like an open switch), the electrons can’t move through the circuit. So, no current flows, and the bulb stays off.
> 🔄 Think of it like a drawbridge: when it’s raised (open), cars (electricity) can’t cross. When it’s lowered (closed), traffic flows freely.
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Q2 - Why do appliances have a plastic covered plug?
✔ Answer:
Plastic is used to cover the plug because it is an
insulator — it does not let electricity pass through easily. This protects people from getting electric shocks.
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Explanation:
Inside the plug, there are metal parts (like copper wires and pins) that carry electricity. Metal is a good conductor — great for electricity, but dangerous to touch. Plastic covers these metal parts so that when you handle the plug, you don’t accidentally touch the live metal. This prevents electric shocks and makes appliances safer to use.
> ⚡ Safety Tip: Always check plugs for damage — if the plastic is cracked or broken, it could expose the metal and become dangerous!
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✔ Summary for Students:
- Turning a switch ON = closed circuit = bulb lights up.
- Open circuit = broken path = no electricity flow.
- Plastic on plugs = safety insulator = no shocks.
Let me know if you’d like a diagram or coloring activity to go with this!
Parent Tip: Review the logic above to help your child master the concept of electricity worksheet pdf.
