When the World needs to Shout FIRE!
When a fire starts burning and others need to be warned, people shout "Fire!"
When people are asleep or not there at all, a fire alarm system does the shouting automatically.
If the building is too big, the fire alarm system shouts when one person can't reach everyone.
A fire alarm system shouts "Fire!" when just one person can't.
ObjectiveWhen a fire starts burning, three objectives are essential to reduce the loss:
Fire Alarm System
Can't do it AloneThe fire alarm system requires people to make it work.
On this website, most references to electrical flow are to the movement of electrons.
Here, electron movement is generally used because it is the electrons that are actually moving. To explain the effects of magnetic forces, the movement of electrons is best.
Conventional current flow, positive charges that appear to be moving in the circuit, will be specified when it is used. The positive electrical forces are not actually moving -- as the electrons are coming and going on an atom, the electrical forces are just loosing or gaining strength. The forces appear to be moving from one atom to the next, but the percieved movement is actually just a result of electron movement. This perceived movement is traveling at a consistent speed, usually around two-thirds the speed of light. To explain the effects of electrostatic forces, the movement of positive charges (conventional current) is best.
See the explanation on which way electricity flows at www.douglaskrantz.com/