What electric current and voltage are and why electric current occurs.
Reviews the definitions of electric current and voltage and why electric current occurs.
Learn how structures in the human ear act like a tiny battery, the role this battery plays in hearing, and other ways it might be used.
Find out how a bicycle can be used to generate electricity and how practical it would be to generate electricity this way.
Learn how a man named Shawn Miller barely survived accidental contact with high-power electric lines and what you can do to stay safe around electric lines.
Learn how devices called transformers change the voltage of electricity in your home and in electronics chargers so the electricity doesn't "fry" the circuits.
Find out whether wearing rubber-soled shoes would really protect you from electricity if you accidentally touch an electric line or are struck by lightning.
Discover what resistors are, how they work, and how to use Ohm's law to find the size of resistor needed for a particular device.
An animation showing how a potential difference causes free electrons in a metal to form a current.