Workshop 6 Web Highlights

"Protons, Neutrons, and Electrons"

All pure substances are composed of atoms. The center of an atom is composed of much smaller parts called protons, which have a positive electrical charge, and neutrons that have no charge. The protons and neutrons bind together in the nucleus. Surrounding the nucleus are even smaller parts called electrons, which have a negative electrical charge. Most atoms have about the same number of protons, neutrons, and electrons.

http://education.jlab.org/atomtour/index.html

"Power"

If we exert a force to pull a heavy object across the floor, we use energy and do work. If we move the object faster, we do the same amount of work, but we use more power. Power is the rate at which a task is performed. We measure power in a familiar unit called the watt. A 1000-watt microwave oven will cook food more quickly than a 500-watt model. It also uses more electrical energy. Another familiar power unit is horsepower (HP). A 50-HP tractor can plow a field much faster than a single horse.

http://www.physicsclassroom.com/Class/energy/u5l1e.html