Basics of Electricity
What are positive and negative charges, and how do they interact with each other?
Opposite charges attract, and similar charges repel.
What happens if you remove a bulb from a circuit?
In a series, all bulbs go out; in parallel, others stay on.
How can you use a magnet to find out if something is made of iron or steel?
If it sticks, the object has iron or steel.
Can you make a magnet with electricity? How?
Moving the magnet pushes electrons in the wire.
How do microwaves heat up food?
They make water molecules vibrate, creating heat.
Why do you sometimes feel a small shock when you touch a metal object after walking on a carpet?
Extra electrons jump from you to the metal, causing a shock.
How does flipping a light switch turn the lights on or off in your room?
A switch connects or breaks the electrical circuit.
What happens if you cut a bar magnet in half? Do you get two north poles and two south poles?
Each half becomes a new magnet with two poles.
How do wind turbines generate electricity?
They spin magnets near coils of wire to produce current.
Why can you hear someone talking on the radio even if they are far away?
Radio waves carry sound signals to your radio.
What is the difference between a conductor and an insulator?
Conductors let electricity flow; insulators block it.
Why does a phone charger heat up when you use it for a long time?
Some energy is lost as heat due to resistance.
How does a compass help people find directions?
The needle aligns with Earth's magnetic field.
How does an electric bell work when you press the button?
An electromagnet moves a hammer to ring the bell.
What makes sunlight different from the light in a bulb?
Sunlight has more types of light waves than bulbs.
How does a battery work to power a flashlight?
A battery pushes electricity through the circuit to light the bulb.
How does adding more batteries in a circuit make a bulb shine brighter?
More batteries provide more energy for the bulb.
Why do magnets stick to a refrigerator but not to a wooden table?
The fridge has magnetic metal, but wood does not.
Why does shaking a flashlight (with no batteries) make it light up?
Shaking moves a magnet to generate electricity.
How does Wi-Fi send signals without wires?
Wi-Fi uses invisible radio waves to transfer data.
Why do two magnets either stick together or push apart?
Opposite poles stick, and like poles push away.
Why do we need circuit breakers or fuses in our homes?
They stop electricity to prevent overheating and fires.
Can you make a magnet with electricity? How?
Yes, by wrapping wire around metal and running current through it.
How do metal detectors at airports work?
They use magnetic waves to find metal objects.
Why do sunglasses block certain types of light?
They block UV rays and reduce glare.