DC vs AC Motor
Why do ceiling fans need AC instead of DC?
Why are elements arranged in groups and periods?
What's the advantage of this structure?
Transformer Tactics
Why can't we use transformers with DC?
Why does metallic character decrease across a period?
Why does sodium behave differently from chlorine?
Loudspeaker Magic
How does a loudspeaker convert electricity into sound?
Why are noble gases unreactive?
Why don't they form compounds easily?
Magnetic Train Tech
How do maglev trains “float” above tracks?
Why does atomic size increase down a group?
What's happening inside the atom?
Electric Bell Wonder
Why does an electric bell keep ringing as long as you press the switch?
Why is fluorine more reactive than chlorine?
Both are halogens, but fluorine is “fiercer.” Why?
Earth Without Magnetism
What would happen if Earth lost its magnetic field?
Why does electronegativity decrease down a group?
Why is oxygen more electronegative than sulfur?
MRI Machine Magic
How do MRI scanners “see” inside our bodies?
Why are alkali metals highly reactive?
Why do they explode in water?
Rainbow Reality
Why do rainbows always appear opposite the Sun?
Study Materials
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