Gravity
Centrifugal force
Relativity
Statical electricity
Falling apple
Autumn leaves
Dream
Folk song
Galileo Galilei
Aristotle
Isaac Newton
Tycho Brahe
Watt
Ampere
Ohm
Volt
The electric battery
The light bulb
The lightning rod
The telegraph
Benjamin Franklin
Alexander Graham Bell
Isaac Newton
Thomas Edison
Electric pressure
Electric current
Electric power
Electrical resistance
Electrical resistance
Electric current
Electric power
Electric pressure
Gravity
Flash memory
Relativity
Speed of light
Ampere
Ohm
Volt
Watt
Amber
Lightning
Magnet
Wool
Frequency
Brightness
Sound pressure
Temperature
Uncuttable
Fitting
Stable
Very small