Work done concept
If I push a wall with all my strength and it doesn’t move, am I doing work?
Transformers
Why is electricity transmitted at high voltage using transformers?
Power in real life
Two people run up the same staircase. One reaches in 5 seconds, the other in 10 seconds. Who does more work?
AC vs DC
Why do we use AC for power transmission instead of DC?
Momentum in collisions
Why does a small bullet cause more damage than a large stone thrown slowly?
Resonance
What is resonance in LCR circuits?
Ohm’s law
Why does a bulb glow brighter when connected directly to a battery than when connected via a resistor?
Wavefronts
What’s the difference between plane, spherical, and cylindrical wavefronts?
Series vs parallel circuits
Why are household circuits wired in parallel, not series?
Young’s Double Slit Experiment
How does YDSE prove the wave nature of light?
Magnetic fields
Why does a compass needle always point north-south?
Polarization
What does polarization of light mean?
Electromagnetism
How does an electric bell work?
Diffraction
Why does light bend around objects?
Short circuits
Why can short circuits be dangerous?
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